smtp server and CNAMEs

Kevin Darcy kcd at daimlerchrysler.com
Wed Feb 8 17:27:38 UTC 2006


Harry Putnam wrote:

>Novice Alert!
>Setup: Gentoo linux (kernel 2.6.15-r3)
>       bind-9.3.2
>       sendmail-8.13.4
>Using bind/named as simple authoritative home lan server
>
>I want to start using a home machine running bind as my mailhub as
>well for home lan.  It won't be subjected to the rigors of the big
>wild internet but I'd like to have it setup as if it would for the
>experience. 
>
>I've setup up a CNAME in zone.192.168.0 that looks
>like this:
>
>    $TTL 1D
>  local.net0.     IN SOA    reader.local.net0.  hostmaster (
>                          200405191 ; serial
>                          8H        ; refresh
>                          4H        ; retry
>                          4W        ; expire
>                          1D )      ; minimum
>  local.net0.     IN     NS      reader.local.net0.
>  smtp.local.net0.         CNAME		reader.local.net0.
>  
>  ; just in case someone asks for localhost.local.net0
>  localhost.local.net0.        A       127.0.0.1
>  [...]
>
>How is that reflected in this zones reverse pointers file?  Or is it
>all just handled by the CNAME line? Currently the revers file looks like:
>
>  $TTL 1D
>  0.168.192.in-addr.arpa.  IN SOA  reader.local.net0. reader.reader.local.net0. (
>                200405190  ; serial
>                28800      ; refresh (8 hours)
>                14400      ; retry (4 hours)
>                2419200    ; expire (4 weeks)
>                86400      ; minimum (1 day)
>                )
>  ; define the authoritative name server
>  4.0.168.192.in-addr.arpa.  IN NS reader.local.net0. reader.reader.local.net0.
>  ; our hosts, in numeric order
>  1.3.0.168.192.  IN PTR  mob2.local.net0.
>  2.4.0.168.192.  IN PTR  reader.local.net0.
>[...]
>
The PTR should point back to a name that owns the corresponding A RR, 
not to a CNAME.

Of course, you didn't show any "reader" A RR in the file for your 
local.net0 zone, so it's difficult to verify the correctness of your 
config...

- Kevin





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