[Anand Buddhdev]

On 07/05/2012 15:29, hugo hugoo wrote:

Hi Hugo,

> I have the following situation in my zone migration for one server
> (A) to another server (B)
> 
> The zone is called toto.be and contains the following record:
> 
> www.toto.be  86400 IN CNAME  www.titi.be
> 
> ==> the zone titi.be is in the same server (A) but is not transferred
> to the server (B).
> 
> 
> If I do a dig @SERVER(A) www.toto.be  ==> I  receive the IP
> corresponding to www.titi.be

This works, because server A knows about both zones, so it can return
the IP address out of zone titi.be.

> If I do a dig @SERVER(B) www.toto.be  ==> I do not receive the IP
> corresponding to www.titi.be

Server B does not know about titi.be, so it cannot provide the IP address.

> - Is this situation due to the fact that dig always and only contacts
> the server mentionned in the command ?

When you run dig like this, it sends one query to a server, and shows
you the response. The dig command does not do recursive resolution.

> - Does the titi.be and toto.be be on the same server to correctly use
> CNAMES?

No. A recursive DNS resolver will be able to follow the CNAME chain from
server B back to A to look up records in titi.be.

Regards,

Anand Buddhdev
RIPE NCC