reverse lookup to CNAME

[Ben Bridges]

> -----Original Message-----
>
> [ ... ]
> 
> On 23.01.09 23:06, Barry Margolin wrote:
> > Why don't you just use normal reverse DNS:
> >
> > zone for 1.1.1.in-addr.arpa
> >
> > 1 IN PTR metis.local.
> >   IN PTR bob-www-sol-l01.local.
> 
> accorging to the above, metis.local is a CNAME, so the 
> reverse should point to bob-www-sol-l01.local. - pointing it 
> to metis.local. would be incorrect.
> And although two or PTRs usually make no problems, it's 
> recommended not to do that, because some SWs jsut can't 
> handle that (even if they would all be correct). So, keep 
> only PTR to bob-www-sol-l01.local.
> 

Section 3.3.12 of RFC 1035 (PTR RDATA format) appears to say that no
constraints are placed upon a domain-name that is the RDATA of a PTR
record, that it is simple data and no special meaning or further
processing is associated with it (hence implying that it is ok if that
domain-name is defined as a CNAME somewhere else in the domain space).
Is that not the case?  Is there some other part of the DNS specification
that forbids it?

Ben Bridges


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