Bind DNS Cname entry

Hello,  I am new to DNS and I need to create a Cname record for a host on our domain abc.domainA.com to resolve to efg.domainB.com .  I tried to create a Cname entry to our Bind DNS but this doesn't work. Our domain is domainA.com.
SyFyAsked:
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Kerem ERSOYConnect With a Mentor PresidentCommented:
They want sip.ourdomain.com to resolve to lync.vendorsdomain.com
In AD DNS, its easy to just create a CNAM and it resolves.  How can we
replicate this in Bind DNS.

IT resolves becasue all your internal hosts resolve all DNS requests over your AD server. But over internet things don't work this way. Every domain is recursively queried and the results are brought after individual queries to the related servers. Since all queries are done individually there's no way that you can CNAME another domain.

So what you will do is to modify the Domain registration for both domains to point to your DNS servers. Setup DNS service for both domains. There's no way that you do it the way you do in your intranet.

Cheers,
K.
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Khandakar Ashfaqur RahmanConnect With a Mentor Expert/ConsultantCommented:
They are different domain.You have to create CNAME within the same domain.

Put the following records:

abc          A                   1.2.3.4
efg          CNAME           abc.domainA.com.
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Kerem ERSOYConnect With a Mentor PresidentCommented:
Hi,

It does not work this way. Since your domain name is domainA.com the DNS server will only lookup and serve requests for domainA.com. So if you want your domain server to respond to domainB.com you2ll need to setup anther zone for the domainB.com over your nameserver.

Please don't forget to edit your domain and make sure that domainB.com has your nameserver IP adresses in the registry so that requests for your doian could reach to your server.

Cheers,
K.
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SyFyAuthor Commented:
Hi All

I tried the Cname and it didn't work.  Let me give more detail.
Our vendor wants us to configure our public Bind DNS as following.

They want sip.ourdomain.com to resolve to lync.vendorsdomain.com
In AD DNS, its easy to just create a CNAM and it resolves.  How can we
replicate this in Bind DNS.
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