Re: Ipchains and smtp rule

From: Mike Bartling (list@zoze.co.uk)
Date: 11/23/01 

Date: Fri, 23 Nov 2001 08:34:12 +0000
From: Mike Bartling <list@zoze.co.uk>
To: monz@danbbs.dk
Subject: Re: Ipchains and smtp rule
Message-Id: <20011123083412.57f95e09.list@zoze.co.uk>

> If I do a telnet mailserver 25, i get a roughly 30 sec delay.
> I've seen remarks about exactly that kind of delay on various lists
> before, and it's usually a dns problem, so I'm going to check the
> caching nameserver setup for errors.

This sounds alot like the identd lookup timeout (rfc1413) since you're probably
blocking that port,

You can disable the query by putting the relevent option in your conf file(s);

exim - rfc1413_query_timeout = 0s
sendmail - Timeout.ident=0s

I'm sure qmail etc will have their equivalents.

Regards

Mike Bartling