Cname vs a record

Film Slate

conclusions: dash. We continue our journey in exploring what SharePoint 2013 Preview has to offer and in today’s post I will be providing you with a step by step guide in creating your first SharePoint 2013 Web Application and Site Collection to host your subsites. Before going ahead, it’s important that you really understand the differences between these two records. CName vs. _tcp. Thanks for the reply. Find how-to articles, watch video tutorials, and get the most out of your Office 365 subscription. DNS is The “CNAME” record stands for “canonical name” and serves to make one domain an alias of another domain. A CNAME record is an alias for the Address (A) record that maps an IP address to the target server. The most popular use for CNAME is that we can use more than one name to map to a single computer FQDN. Name Server records (NS) . This record is listed in HostPilot® Control Panel on your Home Page under the Exchange servers and settings section. For apps using Kerberos it is best to just use an A record. com lives where domainB. 1) Is the DNS server fully resolving the request at once (from CNAME to A-record to Ip-adres) or 2) is it a two step proces (lookup from CNAME to A-record, then another lookup from A-record to Ip-address by the requester). CNAME is a canonical name resource record that creates an alias for a specified FQDN. yourdomain. mydomain. They differ from a CNAME record in that they are not visible to resolvers. To accomplish this, we extended our authoritative DNS infrastructure to, in certain cases, act as a kind of DNS resolver. Configuring the record as CNAME pointing to the FQDN of the Azure service will make sure that your users will always be redirected to the correct server. James Arlen SCADA and ICS for Security Experts: How to avoid Cyberdouchery. Using a CNAME record, you can associate a hostname with another hostname. com. if you use a CNAME for the MX record, then it increases to 3 inquiries…. DNS FundamentalsGeneral Questions Why is DMARC important? With the rise of the social internet and the ubiquity of e-commerce, spammers and phishers have a tremendous financial incentive to compromise user accounts, enabling theft of passwords, bank accounts, credit cards, and more. But, and that’s a big BUT, using a CNAME record will also give you some trouble with SSO. D. This record type is commonly used when you need to associate a hostname with another service provider. jimsbikes. 4: "A CNAME record is not allowed to coexist with any other data. Chris, The reason I suggested using an (A) record was to avoid confusion. The forwarded domain will lose all its records - A, MX etc, and will take the records of the Internet domain it's being redirected to. Notice the trialing dot in the second example. A Canonical Name or CNAME record is a type of DNS record that maps an alias name to a true or canonical domain name. Since the alias names are very user-friendly and easy to memorize, it becomes easier for the end How can I set up a CNAME record for my domain? The CNAME record will point your domain or subdomain to the IP address of the destination hostname. com but not on simply name. com site and it looks like the redirection is working. CNAME setup is a manual process available to paid Cloudflare plans only at the Business or Enterprise level. We have been providing the highest quality shoes, clothing, and accessories to the dance community since 1951. Don’t Miss: /etc/hosts vs. We can, of course, still add this record for you, but only after you confirm that you understand the risks of breaking the RFC. Select the DNS app. If the SPN matches the CNAME, Kerberos will not work. The problem is with a cname you cannot use the cname in the "apex" of a domain. ABOUT DKIM RECORD CHECK. com and get its A record. De DNS-server stuurt het IP-adres van de webserver die is toegewezen aan dat subdomein. With the help of a DNS Alias, also popular as a CNAME record, domain owners who have access to a DNS management interface for their domains can have control over the subdomains they create. There are cases where this limitation is perfectly fine. Port numbers are a totally different piece of cake. This NS record is not considered authoritative, and neither is an A record sharing the same name. com site and it looks like the redirection is working. When you create a pool with a canonical name, BIG-IP Global Traffic Manager(GTM) responds to DNS name resolution requests for the CNAME with the real fully qualified domain name (FQDN). CNAME allows a machine to be known by one or more hostnames. com, creates the host name europe. Obviously with a CNAME there's a level of redirection, so the TTL for the A record it points to in this case may be important as well. Under DNS Records, complete the fields for your CNAME record (see image below). Hi, I'm trying to set up DKIM with our domain in Office 365 for sending emails. js necessita "-rap -segment-name " (i també -url-template, segons la recomanació, però el reproductor també el reprodueix [falten segments finals])Oct 31, 2012 · This post is more about the confusion that may arise around SPNs for setting up Kerberos authentication in IIS 7. A CNAME or Canonical Name record links an alias name to another true or canonical domain name. cname is an actual DNS record type and alias is an AWS custom route 53 solution. This page explains how to set up a Google Cloud DNS managed zone and a resource record for your domain name. The CNAME resource record set is configured correctly if the name on the right side of CNAME is the domain name for your CloudFront distribution. CNAME-Vs&period; Een Record voor een subdomein Wanneer u "mail. In the above example I have defined the nameserver for my machine and the A record determines the IP address pointing to the name server Also I have used CNAME record to use multiple sub domain names for the same nameserver i. The custom domain configured is missing an A record and/or a CNAME record. About the SuperTool! All of your MX record, DNS, blacklist and SMTP diagnostics in one integrated tool. Scroll down to the Records section and click the Add button to add a DNS record Select CNAME from the Type drop-down menu. A CNAME (Alias) record points to an A (Host) record. Please send a request to your current DNS provider requesting a CNAME or SRV record change. See the dig lookup output shown below from my Virtual Machine. com is really this other name, instance001. We've got an application that is trying to use a cname alias to point at a SQL instance and is having issues. First allow the resource record to propagate, and then create the A record. so for efficiency you want to use a record. yahoo. info > Tools > DNS Record Lookup View all configured DNS records (A, MX, CNAME etc. 112. This article explains the differences between these two records. CNAME records are also called "aliases" and "canonical name records". Input the necessary information in order to create a new CNAME record from the text field given to you. mysite. (TTL) associated with every record. example. The ALIAS record maps a name to another name, but in turns it can coexist with other records on that name. I have been reading and I created a new Zone, non-Ad integrated for this bob. farout. CNAME records (short for short for canonical name) map your hostname to another hostname. Return to the first window or tab and copy the contents of the Label/Host field. Amazon Route 53 does not have a default TTL for any record type. A CNAME record is a DNS record that aliases one domain name to another. You are running an SMB file server, such as Windows Server. I suggest you use A record, and not CNAME. Canonical Name (CNAME) records allow you to create alias names that correspond to existing Internet host records. com) to another ‘target’ DNS name (elb1234. In some cases, a CNAME record can be an effective way to redirect traffic from one domain to another while keeping the same URL. The CNAME record is also known as canonical name record. When I first setup this blog on AWS S3 I wanted to use my "naked domain" name. Your DNS host may have Help on their website to assist you in mapping the instructions we show here to the exact fields on their website. A CNAME record is saying "this name inquiry which gave you back a CNAME RR is a pointer to the Canonical NAME (CNAME) of the host you're looking for. In environments with multiple domains, enter CNAME records for DNS in the domains that the sites do not reside in. Create a new CNAME record with name/host/alias as your custom support URL pointing to value yourcompany. Stack Exchange network consists of 174 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers. If you have the option always choose Alias record over CNAME record. DNS changes could take some time depending on the TTL. com is. com lives where domainB. As for the question of A-Name vs C-Name, I do know that the C-name A CNAME (Alias) record points to an A (Host) record. # An NS record or name server record maps a domain name to a list of DNS servers for that domain. For example: CNAME Records in Hosting. com). Hi Experts, In our environment we have Alwayson 2014 Availability Group setup and has a listener. The CNAME record maps a name to another name. Comparing ALIAS and CNAME Records - ns1. Canonical means expected or real name. But I also see a Active directory CNAME record was created and that is been using for application A CNAME record is a DNS record that aliases one domain name to another. A Canonical Name record (abbreviated as CNAME record) is a type of resource record in the Domain Name System (DNS) which maps one domain name to another, referred to as the Canonical Name. This saves a DNS lookup each time a client needs to access one of your resources. For example, if you have a server where keep all of your documents online, it might I'm a small client of an Exchange hosting company who is one of the biggest. It is useful for pointing many hosts to the same place and updating them easily. The difference between having an A record vs CNAME for www would be an extra look up. 96 ms, a difference of 18. I checked with nslookup command and with the mxlookup. If you want to configure an A record, you must first create a CNAME record with your DNS provider for 'awverify. With a CNAME you can forward domains (and their subdomains) to the same IP address. 3. The TTL is set in seconds, so 60 is one minute, 1800 is 30 minutes, etc. Note. There must always be an A record first, and this is known as the canonical or official name. This allows you to point multiple systems to one IP without specifically assigning an A record to each host name. CNAME Records Canonical records (CNAMEs) are useful for pointing one host name at another. com/a/answer/112037?hl=enA Canonical Name or CNAME record is a type of DNS record that maps an alias name to a true or canonical domain name. www, ftp, test etc EX: You have a server with a FQDN of prod01. This allows one name to always resolve to the IP address specified by another name. TTL: The TTL (Time to Live) is the amount of time your record will stay in cache on systems requesting your record (resolving nameservers, browsers, etc. An A record is another type of DNS record, where a hostname points at an IP address. What I need to do is update the MX, Autodiscover CNAME, SPF and SRV records, because I stupidly forgot to copy them down from 1&1 before I moved ownership. bob. The TTL is a value in a DNS record that determines the number of seconds before subsequent changes to the record go into effect. A CNAME (Canonical Name) record, is an alias for another DNS record. If you are an end-user that is experiencing difficulty with an application you are installing or running, contact customer support for the software that is displaying the Stefan Johansson Post author 2016-06-14, Tuesday at 13:49. com, another look will be done for example. no-ip. By default, CNAMEs are often used to ensure that your mail, ftp, and that www versions of your domain load to your proper domain (e. The forwarded domain name will lose all its records - A, MX etc, and will take the records of the domain name it's being pointed to. net'. Web sites are stored in locations that are uniquely identified by a group of numbers, which we know as IP addresses; but to access these sites, we usually type in their corresponding domain names, that are easier to remember. com and www CName vs. The CNAME Record is used only for subdomains. a. 0 has a new Kernel-mode authentication feature using which the ticket for the requested service is decrypted using Machine account (Local system) of the IIS server. The CNAME resource record was defined in RFC 1035 as “the canonical name for an alias. com point to mathdown-cben. Jason, thanks for the suggestion. When you have a CNAME record IE in the backgroud asks for a kerberos ticket with SPN as the host name(KB870911). com) is pointing to the server, which is exchange. co CNAME record maps to mandrillapp. Feb 09, 2015 · The problem is that when i try to add a CNAME record to alias the server name[the host record] in my DNS server for this website, upon requesting the web-page , it starts asking for authentication for all users , including domain users . In section 3. Once that is ok you need to configure the right Azure web site to answer the requests to that address. DNS settings with an Elastic Load Balancer¶. For Windows Server 2008 or Windows Server 2008 R2: from the console of the source DC, start Services Manager (services. A CNAME record is a DNS data type that creates an alias for another address label which is the canonical name of the record. Canonical Name Record (CNAME) A CNAME record maps a single alias or nickname to the real or Canonical name which may lie outside the current zone. 1. For example, the first CNAME on the list would be entered as pictured below. A CNAME record is an alias for an (A) record. ANAME records are most commonly used for CDN (Content Delivery Network) implementations at the root of a domain. The A and CNAME records are the two common ways to map a host name (name hereafter) to one or more IP address. If you create an alias record that routes traffic to another record in the same hosted zone, and if the record that you're routing traffic to has a type of CNAME, you can't create an alias record at the zone apex. com Adding a CNAME record to your domain's DNS settings allows you to create new variations of your website address in the form of subdomains. Now that the Lync 2010 Mobility Service has been out for a week there has been ample time, relatively speaking, to dissect the documentation, run through multiple installation attempts, and perform some initial discovery work on exactly what this new service is and how it appears to function. The name is resolved to the corresponding IP address. Paste the copied contents into the Label or Host field with your DNS records. amazonaws. Check that your new DNS record is active with the DNS Check Tool. . MX record: Mail exchange record maps a domain name to a list of mail exchange servers for that domain. A customer is hosting their company website on a cluster of web servers that are behind a public-facing load. The apex domains mathdown. CNAME records make your DNS data easier to manage. Represents an alias of one name to another: the DNS lookup will continue by retrying the lookup with the new name. com itself. That means you then do another lookup on domainB. Verify that the service registering its service with the endpoint mapper has started For Windows 2000 and Windows Server 2003 DCs: ensure that the source DC is booted into normal mode. The most common CNAME records are the subdomains www and ftp . If that is any other value, for example, the domain name for your Amazon S3 bucket, then the CNAME resource record set is configured incorrectly. org. Unlike a CNAME record, you can create an alias record at the top node of a DNS namespace, also known as the zone apex. However, they have some small differences that affect how the client will reach your site. CNAME - specifies redirects from your domain's subdomains to other domains / subdomains; TXT - these records are used to store text-based information related to your domain. fabrikam. For example, say you have several subdomains, like www. net,mathdown. An A record points directly to an IP address. CNAME (Canonical Name) Record: Short for canonical name, also referred to as a CNAME record , a record in a DNS database that indicates the true, or canonical, host name of a computer that its aliases are associated with. Creating a CNAME record for each of the domain names or subdomains that you have within a hosting account will allow you to point it to a different domain/subdomain. The root of the problem is the client does not correctly form the SPN in the TGS request by creating it using the host name (A Record) instead of the alias name (CNAME). The CNAME source represents an alias for the target name and inherits its entire resolution chain. 0. Basically my thinking was to reduce admin overhead when changing mail filter services - being able to change a single CNAME record is much more attractive than changing the SPF record for upward of a hundred domains, but I take the point about the additional lookup. A CNAME cannot be set up on your bare domain! You could set up a CNAME record on www. tom. CNAME records are a type of DNS record, other types include A records and MX records. I’ll keep it simple. A CNAME record is designed to allow one domain or subdomain to point to another domain or subdomain. multiple A (Host) records for the same computer. You do not need to use this if you've already changed nameservers to Cloudflare and want us to be your authoritative DNS provider. stackexchange. ; Pengalamatan multicast, yaitu pengiriman pesan ke beberapa alamat dalam satu group. One can, for example, point ftp. example. localOne of the less well understood components of a working email system is the MX record. You can use this method if clients use DNS as a name resolution method. nl" in een webbrowser typt, uw browser zwijgend query uitgevoerd op een systeem met een domeinnaamserver. Setting a dns cname (canonical name) record for your domain chapter 8 zytrax. 6. DNAME, if you are not aware, is a DNS record type defined in RFC 2672. It walks through a simple example of creating a managed zone, and then setting up Address (A) and Canonical Name (CNAME) records for the domain. Add a CNAME record for autodiscover. When I originally set this up it was a part of the beta run of Live@EDU service, but it is no longer. com for Hi JS, They are saying CNAME or Alias record. 7. Links in the results will guide you to other relevant tools and information. The CNAME record points a name to another name, instead of an IP. containercult. An A-record refers to the IP address. CNAME records are typically used to An ANAME record is like a CNAME record, but at the root level. no-ip. The CNAME record provides a Working with DNS records. SPF record to tell the world that Google is allowed to handle emails for your domain (this helps other mail servers know that Google is allowed and thus, help prevent filtering For your sanity, our DNS manager prevents you from adding a CNAME record to your root domain. 1} Senders and report processors should allow for extra reports during periods where they have published a change to their DMARC policy. You can highlight the text above to change formatting and highlight code. Below Add a Record:, you can create your CNAME record. Click on the link for the type of record you would like to add, change, or delete: Note: If your domain is registered at another company, please click on the link below for the DNS record you'd like to add, change, or delete and follow the Domains registered at another company set of instructions at the bottom of that article. com to example. We also offer unique, in-house customization of dance shoes, individually fit for each dancer’s comfort and performance. Altering the CNAME record in your -- not Google's -- DNS can allow you to access your company's To set up a new record, you just have to choose the hostname which will be forwarded (domain/subdomain), enter where it will be forwarded to, select the record type, that will be CNAME in this case, and you are going to be all set. The A and CNAME records are the two common ways to map a host name (name hereafter) to one or more IP address. A CNAME record points one of your subdomains to a different domain name. com, you can configure a CNAME record of production. What is an ANAME record? An ANAME record is like a CNAME record, but at the root level. The CNAME record allows users to access this host as files. com is a subdomain of stackexchange. A CNAME record, or Canonical Name record, is a pointer of one name to another. The Global Traffic Manager, aka GTM, and now referred to DNS, is one of the cutting edge modules offered on F5 Networks BIG-IP® platform. The “MX” record stands for “mail exchange” and is basically a list of mail exchange servers that are to be used for the domain. An example of this is www. com will take users to Windows live website. com is. 168. dnscheck. 1) If it is in the CNAME RR points to an A record in the same zone, both the A record and the CNAME record are returned, thus meeting the A record requirement. For example, the company Jim's Bikes, at www. lowewriter. I apologies if this question is already answered, I have one droplet running (1G) and wish to add several sub domains point to multi wordpress sites. As far as a wildcard CNAME, that also violates the uniqueness constraints for CNAMEs. net'. CNAME records require two lookups; A records require single lookups. For example, the track. Currently on my site, users get their own personal site that they can point a custom domain to. Host Record: This is the domain or subdomain you wish to use. There must always be an A record for the machine before aliases can be added. " This is also why a CNAME record is not allowed to exist alongside any other RR type for a given name. Add a record to your DNS settings, selecting CNAME as the record type. CNAME is often used to associate new subdomains with an existing domain's DNS records. View all Certified Solutions Architect - Associate 2018 discussions. com, the zone apex is example. inframan. A CNAME (Canonical Name) points one domain or subdomain to another domain name, allowing you to update one A Record each time you make a change, regardless of how many Host Records need to resolve to that IP address. couldbalancer. PTR records A Pointer (PTR) record is the opposite of an address record: It provides the fully qualified domain name for a given address. Valid for Dyn’s Managed DNS customer accounts only. Add a CNAME record. www. Example: A Record: wfe01. DomainKeys Identified Mail (DKIM) defines a domain-level digital signature authentication framework for email by permitting a signing domain to assert responsibility for a message in transit. It's very common to configure the www record as a CNAME for the root domain (zone apex). Log in to the Cloudflare dashboard. If a CNAME has a TTL of 1 hour that points to an A record with a TTL of 1 minute, will someone who looks up this CNAME have the entire result cached for 1 hour, or will it will keep having to looku I need help. ” It plays the role of a pointer, for example, the CNAME informs the requestor that www. A CNAME record points a hostname to another name that is already created for a server or system. 18 ms vs. e. com and all requests to production. ViewDNS. CNAME Records in Hosting. “Global” is the right word for this module because it has the ability to make name resolution load balancing decisions for systems located anywhere in the World, not just the US. wikipedia. A CNAME record's FQDN (fully qualified domain name) cannot be the same as any other DNS record's. Domain mapping with cname vs a record ? Will the domain mapping plugin work if a user adds a came to the unmapped domain such as test. Note: cPanel is not able to display any record ending with a comment. CNAME (or alias records) and A records both allow you to associate a domain name with a specific server (or service in this case,) however they work differently. I’ve long thought that the DNS CNAME is one of the most underrated infrastructure technologies considering it has been available for a very long time. The name is resolved to the corresponding IP address. If the selector is not valid, please check with your hosting provider if the records are entered correctly in your Domain Name Server (DNS). On the DNS Manager page for the domain, go to Action > CNAME (CNAME) . mydomain. In the Host field, enter the unique zbcode ( zb*******) generated for your domain in Zoho Mail. In our example the Host Record 'ftp' would be for the subdomain ftp. IIS 7. Would having both of these be their own A record (to same IP) improve the situation? Or is there another solution I'm missing? CNAME. Create a CNAME record set with a single record Note The DNS standards do not permit CNAME records at the apex of a zone ( -Name '@' ), nor do they permit record sets containing more than one record. Click Add A Record to create each new CNAME. (sē-nām) Short for canonical name, also referred to as a CNAME record, a record in a DNS database that indicates the true, or canonical, host name of a computer that its aliases are associated with. mywebsite. The alternative solution, multiple A records, is not as simple as using CNAME records. Creating this record will allow you to synchronize your offline address book, show free/busy information and enable the Out of office feature. com), it points to Google Apps login page. The prerequisite for enabling the outbound DKIM signing is – a creation of two CNAME records, that will be created in the DNS server who hosts the specified domain. If you change the IP address of an A record, all CNAME records pointed to that A record automatically follow the new IP address. 1 for the MX FQDN, 2 for the CNAME, and 3 for the final underlying A record. 8 or work. Add the CNAME record in your DNS (Zonealias –> Zone URL). g. The top level of a domain must be an A record, it cannot be a CNAME. For example, scripting. A Record. If you have an Elastic Load Balancer (ELB) for your application (which would be the case if you have enabled a legacy SSL certificate for your application), instead of changing the A record entry, change the CNAME entry for your domain name. CNAME Chain Latency vs. This can prove convenient when running multiple services (like an FTP server and a webserver; each running on different ports) from a single Creating a CNAME record through our Linux cloud website hosting is very simple. conf in Linux I hope this article will help to understand difference between A and CNAME records. Sep 29, 2016 A CNAME, or Canonical Name record, is a record that points to another domain address rather than an IP address. 8 should suffice. Your terminology in this article is so innacurate as …A CNAME, ALIAS and URL records are all possible solutions to point a host name (name hereafter) to your site. If a CNAME has a TTL of 1 hour that points to an A record with a TTL of 1 minute, will someone who looks up this CNAME have the entire result cached for 1 hour, or will it will keep having to lookuI need help. There are several problems with the described situation:Nov 21, 2013 · Microsoft Azure Stack is an extension of Azure—bringing the agility and innovation of cloud computing to your on-premises environment and enabling the only hybrid cloud that allows you to build and deploy hybrid applications anywhere. cname is an indirection (alias) so it is slower, because it looks up and get an A record, which then looks up your ip. On the DNS Manager Settings page, in the Host Aliases: CNAME Records section, click Add/Edit. Record similar to CNAME, specially designed to pointing services in a domain. The Srv record (_autodiscover. CNAME Record CNAME records alias one host name to another. you can even cname a cname. freshdesk. An ALIAS record is a virtual record type that we created to provide CNAME-like behavior on apex domains. Clear the cache and test DNS resolution again. In case of the CNAME the after figuring out that www is a CNAME to example. CNAME records are typically used to May 30, 2017 A CNAME, ALIAS and URL records are all possible solutions to point a host name (name hereafter) to your site. From those rules, we can derive two different behaviors for what happens when an A record exists on a DNS server with the same name: A CNAME is a type of DNS record, where a hostname points at another hostname. 2. Ensure the website you want to update is selected. In our scenario, the 2 “DKIM CNAME” records, will include the following host’s names: Host records are an Infoblox data type that for the purposes of DNS creates A and PTR records for a given host name and IP address. Also called a canonical name records, they act as aliases, pointing to another DNS name. And all of our one-click DNS configurations ensure that this doesn’t happen either. domain1. You can create multiple CNAME records and point them to an A record. One of their most common uses is for SPF data. com will be answered by prod01. This is a non-standard use of record types. CNAME Record CNAME records are referred to as alias records since they map an alias to its canonical name. To clarify my question, the difference between CNAME and A record in a traditional NameServer is that only CNAME can be used to point to a different subdomain and A record must point to …Jan 27, 2016 · Even if you use a CNAME that points to an A record, the hostname in your application's service principal name (SPN) must match the A record. If the IP address of your web server does not regularly change, then you would be even better off just creating an A record for www that points to the IP address of your web server - just like you did for the ftp and mail records. In the past I have installed SBS 2011 and they set it up as domain. mysite. This eliminates the need for explicitly declaring an IP address and means that the IP address can be changed once rather than twice if a CNAME record simply points at an already established host name, as shown in the following example: A CNAME (Alias) record points to an A (Host) record. club. An example of this is: www. Kelebihan IPv6 dibandingkan dengan IPv4 antara lain: Ruang alamat IPv6 yang lebih besar yaitu 128 bit. « Back to home Why it's a bad idea to put a CNAME record on your root domain Posted on 24th February 2014 Tagged in S3, AWS, Domain, Heroku, CNAME, DNS, Naked. google. The CNAME record provides a A CNAME (Alias) record points to an A (Host) record. Alias records work like a CNAME record in that you can map one DNS name (example. If you create an alias record that routes traffic to another record in the same hosted zone, and if the record that you're routing traffic to has a type of CNAME, you can't create an alias record at the zone apex. The Srv record (_autodiscover. com cannot point to a cname. com priority 0 weight 1 port 443 target mail. It should only be used when there are no other records on that name. Currently I have an Active-Active standalone NetScaler configuration with Azure Load Balancer and load balancing working fine . So, if you wanted a second A record modified, you'd have to set up an entirely seperate failover-monitor. com (replace yourdomain with your own domain name – like mail. cname vs a recordA Canonical Name record (abbreviated as CNAME record) is a type of resource record in the Domain Name System (DNS) which maps one domain name to A , CNAME , ALIAS and URL records are all possible solutions to point a host name (name hereafter) to your site. I do find a lot of IT administrators looking after Exchange servers who don't really understand what an MX record is and how they work. Note. A CNAME (Canonical name) is a record used to specify a domain name as an alias for another domain. domain2. CNAME Record CNAME record is actually not a redirect type record but often mistakenly used as such. . I am seriously confused mainly because of the way it was explained in my training at work. Re: How to create an Alias (cname) record to point to a subdomain? Finally, if you are trying to access a subfolder, then reconfigure the web site so that the root is the direct folder tied to the Note: DNS record changes will never resolve if the update is made in the wrong zone file. Canonical name record. com pointing to a subdomain within the Salesforce DNS space, containing SPF and MX records, and possibly a webserver hosting the links contained in the email. For example, many customers alias www. Creating a CNAME record requires a number of basic steps - pick the domain/subdomain, choose CNAME as the type, type in the hostname you are redirecting to, then just click the Save button. One portion that is failing is the Crystal Reporting portion of the app but that is more of a Crystal issue to look into. A CNAME is a DNS record that says that domainA. Creating a CNAME record using our Linux shared web hosting is really simple. com as your website’s address, just enter cdn as the entry next to Fully Qualified Domain Name . A CNAME ties a name to an A record. Be sure to only make A, MX and CNAME updates to the zone file located where the nameservers are pointed. Add a record to your DNS settings, selecting CNAME as the record type. cname=bertand. couldbalancer. 2, it recommends not mixing CNAME records with any other type of record: If a CNAME RR is present at a node, no other data should be present Even that is a little ambiguous -- in the jargon of the IETF, "should" usually denotes a recommendation, as opposed to "must," which denotes a mandate. If it's a third party, use the CNAME so that they can change the IP addresses as needed without you having to change your configuration. by Jack Chen, Taos Senior Technical Consultant. I'm still running 2007 on their end and on my end. domain1. You must always What is an ANAME record? An ANAME record is like a CNAME record, but at the root level. com) is pointing to the server, which is exchange. With DNS CNAME you can only point from one hostname to another. So new server pointing at oldserver and having isues with newserver\instance. En. Keamanan lebih bagus dengan adanya default sekuriti IPSec. Cname vs a record youtube. If so it's just like pointing to any other record. CNAME records were originally conceived of for use only when the CNAME points to a zone over which you have no control, so if the IP# changes DNS can still find it. com domain, but I don't know how to setup the actual CNAME record. A CNAME (Alias) record points to an A (Host) record. ) for a specified domain name. contoso. Click on the link for the type of record you would like to add, change, or delete: Note: If your domain is registered at another company, please click on the link below for the DNS record you'd like to add, change, or delete and follow the Domains registered at another company set of instructions at the bottom of that article. Help and support for the Microsoft Outlook app on PC, Mac, and mobile. Yes, the number there is the number of seconds left until that record expires (providing we're not querying the authoritative nameserver). The traditional security industry has somehow decided that they are the white knights who are going to save everyone from the horror of insecure powergrids, pipelines, chemical plants, and cookie factories. The aliased domain gets all the subdomains and DNS records of the original. In Bind the syntax is and the real name can be a sub-domain. For instance, www. A: Unfortunately, what you're running into is a limitation of the DNS specification. You'd use an A record if you're in control of the IP address yourself. The NS record specifies an authoritative name server for given host. HOW TO USE FREENOM DNS SERVICE FREENOM SUPPORT. _msdcs. With DNS CNAME you can only point from one hostname to another. The biggest reason to use a SQL Alias over a cname is so that you can alias multiple instances on the same SQL Server. The @ symbol is used to indicate the root domain itself. 8 Asked 2 years ago. Both serve entirely unique purposes, so it is important to understand the differences so you know which to use at the right time. For example, adding "blog" as a CNAME for the domain "mywebsite. With CNAME setup, authoritative DNS remains elsewhere, and one or more subdomains are delegated to use Cloudflare using CNAME DNS record(s). com; this ensures that both www. com domain, but I don't know how to setup the actual CNAME record. The DKIM record is correctly configured when the DKIM Checker shows ‘This is a valid DKIM key record’. 252. Canonical simply means the expected or real name. cloud. It refers to another full host name and not to an IP address. My suggestion would be to always use CNAME (or alias) records if you need to assign multiple names to one computer, vs. by Jack Chen, Taos Senior Technical Consultant. com In the case of an ALIAS record, all of the same actions are taken as with the CNAME, except the authoritative server for example. Each of your domain's DNS records, such as an MX record, CNAME record, and so on, has a TTL value. Use CNAME if you are using a non-Route53 DNS, but use Alias sets if you are using Route53 (unless you have a reason for wanting a really legacy setup). Explains what is a CName record and where it used and also the difference with "A" Record. To find this page for your domain, see Find your DNS records in Windows-based DNS . Simply put a DNS CNAME is an alias record A CNAME record is a domain alias, and points a host name to another host name. elb. Feb 24, 2013A Canonical Name record (abbreviated as CNAME record) is a type of resource record in the Domain Name System (DNS) which maps one domain name to Oct 16, 2014 by Jack Chen, Taos Senior Technical Consultant. CNAME records are a type of DNS record you can use to point a hostname elsewhere. CNAME (Canonical Name) Record: Short for canonical name, also referred to as a CNAME record , a record in a DNS database that indicates the true, or canonical, host name of a computer that its aliases are associated with. A DNS alias name a. The ALIAS record behaves like an A record returning one or more A records matching the alias target. com, mail. com . However, they have some The chief difference between a CNAME record and an ALIAS record is not in the result—both point to another DNS record—but in how they resolve the target Firebase hosting is probably marking CNAME records as Firebase Hosting gives you the option to add A records in your DNS with not just The A record maps a name to one or more IP addresses, when the IP are known and stable. Created with Sketch. " A CNAME record does not require hard-coded IP addresses and allows Heroku to manage the set of IPs associated with your domain. The information on this page is intended to be used by programmers so that the software they write can better deal with errors. In case the users DNS A-record request would point at the end to a non-authoritative cname on DNS-Express we will just respond with the cname RR only and the LDNS (local ISP DNS for that dial-up) would do the recursion. You’ll want to use an A Record for your DNS entry if you have an IP address that the domain/subdomain should point to or if you want to establish a domain/subdomain to be used as the place to point a CNAME. , naked domain, such as example. com" as the hostname value. Go to the section which says DNS or Name Servers. shai-arvixe. net provides email and mobile support tools to assist you with step-by-step explanations of email set up processes and service features. How to setup A, MX, CNAME or other records for a domain name. To overcome this limitation, you can create a CNAME record for the domain name and configure your clients to access this path when accessing DFS. ” It plays the role of a pointer, for example, the CNAME informs the requestor that www. Multiple A record vs CNAMEs (For one IP) 13 August 2013 System Admin A record , CNAME , dns Hazrul Nizam Sidek I have been thinking about the best way to handle DNS for multiple services pointing to one IP address. CNAME records simply allow a machine to be known by more than one hostname. If you want to add your own A, MX, CNAME or other DNS records, What is a CNAME Record? A CNAME, or Canonical Name, Resource Record (RR) creates an alias for a fully qualified domain name (FQDN) in the DNS database. office,smartboard # smartboard is in /etc/hosts Originally, the last line had been an unqualified name, but for some reason that I can't fathom, cnames aren't handled with the expand-hosts So for a DMARC record where “p=reject” and “pct=60,” 60% of traffic would be rejected if it fails the DMARC check, and 40% would be quarantined. azurewebsites. Reverse-lookup Pointer records (PTR) . however, it is not a cut and dry thing really so you just have to weigh it and see which way to go. A CNAME record tells the DNS service that when the site’s Domain doesn’t point to an IP, but rather at ANOTHER URL. the ALIAS record 44. CNAME records are used to identify multiple domain names that point to the same IP address. This can prove convenient when running multiple services (like an FTP server and a webserver; each running on different ports) from a single IP address. To create an external DNS CNAME record, you’re going to need to connect to your public DNS provider, and then follow our steps. com will point to domain. com, ftp. nl The TTL value determines how long a DNS record stays cached on DNS servers. Apr 18, 2018 · Describes how to consolidate print servers in Windows Server 2003 and in Windows 2000 Server with minimal effect on clients by using DNS Alias (CNAME) records. I had always used CNAME for autodiscover and it always worked fine until a couple months ago when they had a severe server failure that had about 10% of their customers down for about 18 hours. While they aren't needed by most users, there are situations where you will want to create a CNAME record for your domain. It is needed when multiple domain names are resolved to one and the same IP address by a DNS server. Differences between the A and CNAME records. com if they prefer. CNAME record, so that if you type mail. com it comes back with the ip address of the network solutions server. com If I try to ping autodiscover. So, if the IP of the destination hostname changes, you won't need to change your DNS records as the CNAME will have the same IP. One of the challenges of using a service like Amazon Web Services (AWS) Elastic Cloud (EC2) is you need to point your DNS to a Pay particular attention to formatting, either: work A 5. One such live example i saw was " www. Even if you use a CNAME that points to an A record, the hostname in your application's service principal name (SPN) must match the A record. 57, and another one for SERVER_Y pointing to 192. How to Change CNAME Record Changing CNAME record is particularly useful if you are going to configure your domain to use professionally branded email address with Outlook. However, CNAME records are not available at the zone apex and can’t be used to configure root domains. com might link to example. com instead of adding an A Record pointing to IP of site? More Domain Mapping discussions . CNAME setup is a manual process available to paid Cloudflare plans only at the Business or Enterprise level. CNAME records (short for Canonical Name) map your hostname to another hostname. For example, if you picked cdn. This occurs because the standard zone template uses a CNAME record to point the mail server to the domain's A record. You cannot point a CNAME record towards an IP address. It allows moving services between servers, and can define group of hosts serves any service, and moving service between hosts. Creating a CNAME record for any one of the domains or subdomains you've got in a hosting account allows you to redirect it to a different domain/subdomain. This is like someone coming into the grocery store to get a hypo-allergenic rubber ducky, and the clerk saying “Gee, I dunno, but ask Donny at the bar across the street…he’d know”. There are also some specific considerations when using A records with Azure Cloud services that you should consider before deciding which to use. We can’t describe exactly where you’re going in your DNS provider’s environment as there may be different ways of managing your external DNS, but we hope these steps help. com. 3} Configuration. cname vs a record. I have an outlook web access site, lets call it, https://mail. CNAME records allow an administrator to point multiple systems to one IP without specifically assigning an A record to each host name. What is often done to work around this is to put in an A record pointing to the IP of a webserver, which performs a 301 redirect to the "www" record. It is used for specifying that a domain name is an alias for another domain, the “canonical” domain. I will need your help on a specific issue please. DNS is not “better” since this is all DNS. voorbeeld. uk' that points to 'awverify. Hi Folks, I have a Sharepoint site on my intranet running on a Server 2008 R2 box. com and '@' would be google. org. containercult. this way if u have to change web A CNAME record to another host in the same domain will be just as fast as an ANAME record. <DnsForestName> What we needed was a way to support a CNAME at the root, but still follow the RFC and return an IP address for any query for the root record. com and get its A record. {7. ; Stateless address autoconfiguration (SLAAC), IPv6 dapat membuat alamat sendiri tanpa bantuan DHCPv6. A CNAME record. server. It points to another host record, not to another domain/subdomain. 22 ms” This is a startbut given the number of Step 1: Creating a CNAME record in your DNS Zone File Login to your Domain Control Panel. DsaCname Record - <DsaGUID>. IPv6 vs IPv4. To add a new CNAME record: 1. The host name of a machine that is stated in an A record is called the canonical, or official name of the machine. meaning mydomain. _domainkey CNAME Records. Hello, I have been unsuccessfully wrestling with the difference between the hostname of a machine and an alias for the domain name associated with that machine that appears as an A record in the DNS. edu domains. com) and the other is not. I have a cname that I use to make it easier on the end users so they don't have to type the machine name. So when a server queries for the MX record, it is actually doing two DNS queries… one for the MX FQDN, and a second for the A record…. In this KB article we’ll address a common question we receive about the difference between a CNAME and a Web Redirect (also referred to as a URL redirect). When you create the SRV record in Windows, is the SERVICE a drop down menu that allows you to select a predefined service or is it anything you wish to type in? A CNAME can direct a request to a taget host which I can make it the mail server. When you create the SRV record in Windows, is the SERVICE a drop down menu that allows you to select a predefined service or is it anything you wish to type in? A CNAME can direct a request to a taget host which I can make it the mail server. Webopedia defines CNAME record, as “a record in a DNS database that indicates the true, or canonical, host name of a computer that its aliases are associated with. A CNAME or canonical name record is the DNS equivalent to a Microsoft Windows shortcut or an Apple Mac alias. IPv6 vs IPv4. A CNAME is a DNS record that says that domainA. Most users in the Rutgers Infoblox system may only create CNAME records in their own sub-domains of the main rutgers. From RFC1912 section 2. In a fight between an A record and a CNAME record, who wins? In other words, if I have an A record for SERVER_X pointing to 192. Somewhere down the chain you have to have an A record. You can't point an A record to the IP address of the ELB, because ELB's don't have predifined IP addresses. The server has files and resources that are configured by using their NetBIOS name, the DNS fully qualified domain name (FQDN), and their alias (CNAME). Most users may only create host record in their own sub-domains of the main rutgers. A CNAME record specifies that a domain name is an alias of another domain. An A record is the actual record. Next to Fully Qualified Domain Name , enter only the part of your website address that you designated for your CDN Zone. {8. google. Jul 30, 2011 · We've got an application that is trying to use a cname alias to point at a SQL instance and is having issues. Creating this record will allow you to synchronize your offline address book, show free/busy information and enable the Out of office feature. # A CNAME record or canonical name record makes one domain name an alias of another. Configuring the record as CNAME pointing to the FQDN of the Azure service will make sure that your users will always be redirected to the correct server. An A record is the actual record. k. The browser client has cached the old IP address of your domain. com". Sure. co CNAME record maps to mandrillapp. As opposed to forward DNS resolution (A and AAAA DNS records), the PTR record is used to look up domain names based on an IP address. Create a CNAME record aliased to the load balancer DNS name. com In the Destination CNAME field enter in the CNAME record. When a name server looks up a name and finds a CNAME record, it replaces the name with the canonical name and looks up the new name. The Hepsia hosting Control Panel, which we provide with each and every hosting, will permit you to create CNAME records for every domain address or subdomain hosted within the account with several clicks. website. nl, but instead of assigning it an IP address create a CNAME record and point it to autodiscoverredirect. It is CNAME like, but while CNAME provides a single substitution (or aliasing) at the owner (left-hand) name of the associated CNAME RR, DNAME provides substitution (or aliasing) at all levels below the owner-name associated with the DNAME RR. This is the domain name that you wish for the CNAME record to point to. Nov 21, 2013 · A CNAME record tells the DNS service that when the site’s Domain doesn’t point to an IP, but rather at ANOTHER URL. A smaller interval, such as 5 or 10 minutes, will allow you to reverse any changes faster in the event you need to revert back to your original configuration. So, A record points a name to an IP address and CNAME record can point a name to another CNAME or an A record. rhcloud. The DKIM Record tool will test a domain name and selector for a valid published DKIM key record. Member Type A CNAME record for bouncehandling and SPF checks: sub. Read more in our knowledge base about RFC-compliant support for CNAME at the root. One portion that is failing is the Crystal Reporting portion of the app but …A CNAME (Canonical Name) record, is an alias for another DNS record. 60, and [SOLUTION] CNAME vs. Functionally, while you might be serving the same content on both domains, they are distinct and independent websites. Our interface automatically chooses whether a record is a CNAME or an A record based on the type of data you supply. So there is a slight performance penalty on lookups if you use CNAME records rather than individual A records for your subdomains. The CNAME resource record was defined in RFC 1035 as “the canonical name for an alias. azurewebsites. A CNAME-record cannot exist with any other records for the same name, because a name cannot both be an alias (CNAME) and something else at the same time. So is a CNAME and many other this. Important: The exact name of the boxes or fields you type or paste the information into, to create each type of DNS record, are different for each DNS host. 4. In case you have a hosting plan through our company and you want to set up a CNAME record, it will take you a few mouse clicks to do it. While trying to add A records and CNAME via the Digital ocean networking panel, it will only allow me CNAME records can once again point to another CNAME record, although this must be avoided, but will work if properly configured. Your current CNAME records are listed in editable form, and any Network Solutions service that is associated with the CNAME record is listed under the Other Host text box. I've implemented what seems to be the simplest solution by creating a CNAME pool along with the VS pool and, using Global Availability, ordering the pools accordingly. CNAME record: Canonical name record is an alias of one name to another. A 5. webmasters. com and example. domain2. 16. Right now they point their domain to their site by setting the a-record to our server's IP. com ". About CNAME records - G Suite Administrator Help - Google Support support. msc) and verify that the Active Directory Domain Services service is running. com, mail. The A record points a name to a specific IP. Working with DNS records. Used to create a private pseudo-record to allow the CNAME functionality at the apex of a zone for A & AAAA record types. com resolves to 204. If you are familiar with the DNS’s CNAME record, then think of DNAME as a sort of super CNAME. org A Canonical Name record (abbreviated as CNAME record) is a type of resource record in the Domain Name System (DNS) which maps one domain name to another, referred to as the Canonical Name. uk' that points to 'awverify. The chief difference between a CNAME record and an ALIAS record is not in the result—both point to another DNS record—but in how they resolve the target DNS record when queried. The practical difference between A and CNAME records is that CNAME will cause an additional lookup (to resolve the alias to the canonical name) which is not incurred with a direct A record. com This is what I'm looking to do. Related Lesson DNS 101. 112. So new server pointing at oldserver and having isues with newserver\instance. ). If you include a comment, cPanel indicates that there are no MX records and that it is defaulting to the main A record, but this is not true. The most notable the www name, universally recognized as the alternate address for your root domain. Input a domain name or IP Address or Host Name. You can access the DNS records for all domain addresses and subdomains hosted in your account through the Hepsia CP included with each and every plan and adding a new record is as simple as clicking on a button, picking out the type After adding the above CNAME record entry in a domain’s DNS records, visiting mail. Nov 14, 2012 · I setup a srv record an hour ago because of the problems above see below: _autodiscover_tcp_club. CNAME records are helpful when pointing multiple domain names to the same host. This could be on your domain name, or on a separate domain name. Below you will find the correct Hostname and Target Hosts to create. There are several problems with the described situation: Microsoft Azure Stack is an extension of Azure—bringing the agility and innovation of cloud computing to your on-premises environment and enabling the only hybrid cloud that allows you to build and deploy hybrid applications anywhere. com performs steps six through thirteen for you, and returns the final answer of an IP address. I cannot access this inside the network, only externally. But when I logon on one NetScaler redirects me for authentication to another and so on (loop). com etc and you want these sub domains to point to your main domain name mydomain. MX Record Tutorial Learn how to configure the MX records for your domain name If you have your domain name pointed elsewhere, but you wish to have your mail handled by SiteGround, you can easily achieve this by pointing your domain's MX (Mail eXchange) record to us. Ask Question. Sep 29, 2016 What is the difference between CNAME and A records, and when should they A CNAME, or Canonical Name record, is a record that points to Feb 24, 2013 Explains what is a CName record and where it used and also the difference with "A" Record. com are always assigned to the same IP address. com, ftp. For example, if the Fabrikam network environment includes a second domain called europe. The process is as simple as that and the new record will be active almost immediately. _tcp. cname vs a record I've recently been doing some research and it appears that using a cname would be better because it points to a I'm not sure if you need a DNS name for an AG group, especially if the AG group is going to potentially span multiple subnets. If you want to configure an A record, you must first create a CNAME record with your DNS provider for 'awverify. As a result of this difference, one is safe to use at the zone apex (e. Net Logon also registers a DNS CNAME (alias) record for use by Active Directory replication The Locator does not use this record. exchange14. However, keep in mind that a CNAME record does not function the same way as a URL redirect. com that points to the Intermedia Autodiscovery DNS record. You do not need to use this if you've already Add the email (Exchange) Autodiscover CNAME record. 0. Create a CNAME Record for a Computer To create a CNAME record in DNS database in Windows Server 2008 R2, administrators must follow the steps given as below: Log on to Windows server 2008 R2 DNS server computer with domain admin or enterprise admin account credentials. The CNAME lookup is done directly against the domain's authoritative name server, so changes to CNAME Records should show up instantly. Unfortunately, the powers that be have forced me to leave it as a manual step. Canonical Name records (CNAME for short), allow you to set up aliases of your domain name to point towards an A record. Jan 25, 2014 · I just started reading some discussions but wanted some new feedback. Add the CNAME record in your DNS (Zonealias –> Zone URL). Note: We recommend that you create an Autodiscover CNAME record for every domain on your account, this includes domain aliases and accepted domains. However, they have some small differences A and CNAME records are the two common ways to map a host name to an address. com is really this other name, instance001. com cannot be both a CNAME and an MX record at the same time. Hi Carl, your articles are too informative and helpful for me. A subdomain is what you described as 'the left side of the domain', e. Create a DNS entry for autodiscover. IP addresses. A CNAME, or Canonical Name record, is a record that points to another domain address rather than an IP address. com, CNAME records are entered for these sites in the Europe domain. The CNAME resource record set is configured correctly if the name on the right side of CNAME is the domain name for your CloudFront distribution. A A record is a DNS entry. Our in-house built Hepsia CP has a section dedicated to the DNS records of your domains, so you can create a new CNAME record for any domain or subdomain hosted inside your account in just a few basic steps. For example, test. dnscheck. com resolves to 204. With Google Cloud services, you use CNAME records to customize a Google service address or the address of a web site built with Google Sites. com or some other service provider. CNAME is a user-friendly name that is created for public distribution. For example, if you register the DNS name example. ALIAS / ANAME CNAMES 63. cloud. Help and support for the Microsoft Outlook app on PC, Mac, and mobile. name. Instead of using a CNAME to point to your loadbalancer, you can alias entry which will cause a DNS entry to return what would be the A record of the resource you're pointing to. 252. A CNAME record is a type of resource record that specifies that the domain name is an alias of another canonical or generally accepted domain name. Cloudflare "CNAME-flattening" nicely returns an A record; unfortunately it's served with a huge TTL of 7 days(!), which causes a long outage when the underlying IP changes. For example, if you wanted to use Google Sites to host/manage your web site, you would create a CNAME record with "ghs. Ns1. CNAME record is an abbreviation of Canonical Name Records, which is responsible for the aliases of the real host name of a computer, all enabled by DNS. Difference Between A Cname Record And A Domain Pointer Dec 17, 2006. If you change the IP address of the domain's A record, your mail server's IPv4 address also automatically changes. The main difference between CNAME and other redirects is that CNAME is just a DNS record type (similar to A, TXT and other DNS level records) while 301, 302 redirects and URL frames are hosting server-powered redirects. You must always Jan 27, 2016 · Even if you use a CNAME that points to an A record, the hostname in your application's service principal name (SPN) must match the A record. CloudFlare now supports CNAME Flattening, which is a better solution to this same problem. com etc and you want these sub domains to point to your main domain name mydomain. From my understanding i need to create a CNAME in the DNS records of the domain that look like: selector1. The www record is a CNAME to the A record. Everyone. domain. com cannot be a CNAME, it must be an IP address, because that's what the value of A records are. CNAME is good for example if your running a web server with multiple webs on 1 ip you can cname all to 1 DNS record . STEP 5: Once you are ready to add a new CNAME record click on the “Add CNAME Record” and it should redirect you to new page. A record vs DNS what is better. /etc/resolv. Hi, If you already have an A record for your sub domain you need to verify it points to the right IP. That should make perfect sense. So instead accessing \\domain\dfsroot\publicshare\user01 you can create a cname such that users can connect to \\CNAMEforDomain\dfsroot\publicshare\user01 . com). ANAME records are most commonly used for CDN (Content Delivery Network) implementations Firebase hosting is probably marking CNAME records as Firebase Hosting gives you the option to add A records in your DNS with not just The chief difference between a CNAME record and an ALIAS record is not in the result—both point to another DNS record—but in how they resolve the target A Canonical Name record (abbreviated as CNAME record) is a type of resource record in the Domain Name System (DNS) which maps one domain name to another, referred to as the Canonical Name. A CNAME record is a resource in a Domain Name System that controls how Web requests are redirected. Alternately, if you have CNAME records that point to the domain named used in the A record, you can switch them all over with just one failover-monitor. Our in-house built Hepsia Control Panel features a section committed to the DNS records of your domain names, so you can create a new CNAME record for any domain or subdomain hosted inside your account in a couple of easy steps. GTM – Global Traffic Manager Overview. com" creates the subdomain "blog. 16. PTR record: Pointer record maps an IPv4 address to the canonical name for that host. 2) SMTP servers are required to accept an alias and look it up. eljay014. <alias-name> IN CNAME <real-name> A CNAME isn't a redirect, it's an alias to another DNS record