DNS pointing to domain without www.?

[Rudi van Houten]

In <0ac354201021979CPIMSSMTPU07 at email.msn.com> "Jake Odell" <Jake_Odell at email.msn.com> writes:


>Hm..  don't arpa PTR RR's essentially exist for domain A records, with (possibly multiple) CNAME's "resolving" to a host with an A record?   Don't reverse lookups only occur for IP addresses?

>What would be wrong (or unusual) with in the domain zone:

Since ns.domain is a CNAME it may not occur as value in other
resource records. The same goes for smtp.domain, since it is a
CNAME it may not be mentioned as value in a MX-RR.

>domain. IN NS ns.domain., admin.domain. 
>..
>machine IN A 192.168.0.10  ;points to an IP address
>smtp IN CNAME machine  ;points to a host name
>pop IN CNAME machine  ;ditto
>ns IN CNAME machine  ;ditto
>domain. IN MX 10 machine
>..

>and in arpa zone:

>..
>10.0.168.192.in-addr.arpa. IN PTR machine.domain.
>..

>??

>where would resolution, reverse or otherwise, break down for ns, pop, or smtp?
>How else would you do it?
>  Shaun Joseph <Shaun.Joseph at usa.alcatel.com> wrote in message news:37963EAC.77A1769D at usa.alcatel.com...
>  Media Master wrote: 
>  --8<--

>  In general (and certainly in this case) you DON'T want to have two canonical names for the same IP address.  It (probably) won't break anything if you do, but it's bad form and breaks consistency with your inverse pointers. 

>  --8<--



--
Rudi van Houten	  Faculty of Mathematics Utrecht University
Budapestlaan 8  -  3584 CD  -  Utrecht  -  Netherlands
:-) Fantasy is given mankind to make amends for what he is not,
    and a sense of humour as consolation for what he is.