bind timeouts

[Cyrille Lefevre]

"Matthew D. Fuller" <fullermd at over-yonder.net> wrote:

> On Tue, May 18, 2004 at 08:14:04AM +0200 I heard the voice of
> Christian Hiris, and lo! it spake thus:
> > 
> > As far as i know MX records _must_ have an A record.
> 
> RFC1035 states:
>     MX records cause type A additional section processing for the host
>     specified by EXCHANGE.  The use of MX RRs is explained in detail
>     in [RFC-974].
> 
> RFC974 says:
>     There is one other special case.  If the response contains an
>     answer which is a CNAME RR, it indicates that REMOTE is actually
>     an alias for some other domain name. The query should be repeated
>     with the canonical domain name.
> 
> RFC2821 obsoletes 974, but says substantially the same in regards to
> CNAME's.  So, by the RFC's it's allowed.
> 
> 
> For me, I think it's a bad practice.  But, hey...


not necesserally, an mx could point to a cname which is an rr record :)
which could explain why this is allowed.

google search : bind "in mx"

http://www.zytrax.com/books/dns/ch8/mx.html
http://www.zytrax.com/books/dns/ch9/rr.html

Cyrille Lefevre.
-- 
home: mailto:cyrille.lefevre at laposte.net