Re: Reverse dns

[Valdis.Kletnieks () vt edu]

On Thu, 10 Mar 2005 09:57:57 CST, Paul Schmehl said:

> I've been looking through the RFCs and I can't find it.  Some folks think 
> reverse dns should be completely disabled.  I know for sure that this will 
> break email, because many mail servers won't talk to a server that doesn't 
> reverse.  Tcpdump also doesn't like hosts that won't reverse.

"tcpdump -n" is your friend. :)

There's no RFC requirement that there be a valid PTR record.  Also, note that
there's *lots* of games that can be played with PTR records if they happen to
be out of a in-addr.arpa zone controlled by the attacker.....

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