Guys/gals,
This may interest all those maintaining private IP internal networks.
Are you getting connection failures from your linux services... ?
Read on.
---------- Forwarded message ----------
Date: Thu, 26 Jul 2001 04:08:00 GMT
From: Victor Duchovni <[EMAIL PROTECTED]>
To: Postfix users <[EMAIL PROTECTED]>
Subject: RE: lost connections from client software
Note that last night reverse resolution for 192.168.* disappeared
on the public Internet (NS now points to BLACKHOLE.ISI.EDU). Previously
the reverse zone was server by a name server that provided NXDOMAIN for
all the 1918 addresses. This means that any DNS nameservers that did not
stub out RFC1918 networks have just started taking long timeouts before
giving up on the reverse resolution. This might be the cause of the
problem here.
--
Viktor.
> I've seen this happen before not only with postfix but with
> pop and imap
> clients as well. It turned out that the clients were timing
> out because
> the server took too long in looking up the reverse-dns of the client,
> which at the time did not exist. If your clients are on a private
> network, stub a reverse dns SOA and put it on your DNS
> server, this will
> make queries either return immediately with an error or with a valid
> reply.
_
Philippine Linux Users Group. Web site and archives at http://plug.linux.org.ph
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