Date: Wed, 28 Aug 2002 12:58:09 -0400 From: "Dan Langille" <dan@langille.org> To: "Michael Scheidell" <scheidell@secnap.net> Cc: <freebsd-hackers@FreeBSD.ORG> Subject: Re: why does this sendmail connection take so long? Message-ID: <3D6CC8E1.8800.896A6F03@localhost> In-Reply-To: <003e01c24a2b$31eb7980$3301010a@MIKELT>
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On 22 Aug 2002 at 18:28, Michael Scheidell wrote: > ----- Original Message ----- > From: ""Dan Langille"" <dan@langille.org> > Newsgroups: local.freebsd.hackers > Sent: Thursday, August 22, 2002 1:41 PM > Subject: why does this sendmail connection take so long? > > > > I'd normally attribute this problem to DNS, but I can't track down > > what DNS problem is occuring. Note the lag between the first event > > and the next. Any suggestions? > > might be identd (port 113) After some testing, I'm inclined to think it's not ident. The network in question is behind a firewall which is doing NAT. Two boxes do not exibit the problem. Two do. All are FreeBSD 4.6-stable created from same source snapshot. I've tested this from several boxes behind my firewall each time emailing to a box outside the firewall. The test was: echo 'hi there' | mail dan@m20.example.org The two boxes which exibit the probem are the DNS server and the firewall. Mail sent from those boxes exhibit identical delays, namely a 75 second lag between the first and second event (see below for an example; note that I've changed the real domain to example.org). I'm not sure whether this indicates a problem on the sending or receiving end. I suspect sending. But what the problem is I'm not sure yet. I've been running "tcpdump -i lo0 port 53" to see if I could find anything suspect in there, but I didn't. BTW, what would I be looking for if the above delay is caused by DNS? Thanks. Aug 28 12:07:24 xeon sendmail[66323]: g7SG7O7G066323: from=dan, size=37, class=0, nrcpts=1, msgid=<200208281607.g7SG7O7G066323@xeon.example.org>, relay=dan@localhost Aug 28 12:08:39 xeon sm-mta[66507]: g7SG8dvj066507: from=<dan@xeon.example.org>, size=351, class=0, nrcpts=1, msgid=<200208281607.g7SG7O7G066323@xeon.example.org>, proto=ESMTP, daemon=MTA, relay=localhost [127.0.0.1] Aug 28 12:08:40 xeon sendmail[66323]: g7SG7O7G066323: to=dan@m20.example.org, ctladdr=dan (1000/1000), delay=00:01:16, xdelay=00:01:16, mailer=relay, pri=30028, relay=localhost.example.org. [127.0.0.1], dsn=2.0.0, stat=Sent (g7SG8dvj066507 Message accepted for delivery) Aug 28 12:08:42 xeon sm-mta[66509]: g7SG8dvj066507: to=<dan@m20.example.org>, ctladdr=<dan@xeon.example.org> (1000/1000), delay=00:00:03, xdelay=00:00:02, mailer=esmtp, pri=30342, relay=m20.example.org. [216.187.106.227], dsn=2.0.0, stat=Sent (Ok: queued as 169F57A11) -- Dan Langille I'm looking for a computer job: http://www.freebsddiary.org/dan_langille.php To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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