Date: Wed, 8 Dec 1999 16:03:51 +0200 (SAT) From: John Hay <jhay@mikom.csir.co.za> To: stevenf@shellnet.co.uk (Steven Fletcher) Cc: freebsd-net@FreeBSD.ORG Subject: Re: Very odd problem with email. Message-ID: <199912081403.QAA81133@zibbi.mikom.csir.co.za> In-Reply-To: <277A0E0FE38ED311A66A00A0C9D43A3D0781F5@data.shellnet.co.uk> from Steven Fletcher at "Dec 8, 1999 11:36:43 am"
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> > I have now tried what I consider to be 'everything' - swapping the > mailserver hardware, swapping the POP3 server that we use (tried QPOP & > Cucipop - QPOP emails are getting slightly further than those delivered via > Cucipop). Running tcpdump on both the affected machines (the mailserver & > the external machine) shows that ACK's don't seem to be getting through: > > 16:42:31.530365 194.129.209.11.pop3 > www5.shellnet.co.uk.4969: P > 1590:2928(1338) ack 35 win 17520 (DF) > > Is repeated at increasing intervals after the file stops. One possibility is that the path mtu discovery is getting screwed up somewhere. That may happen if some link have a smaller mtu that your local net and icmp NEEDFRAG packets are blocked. John -- John Hay -- John.Hay@mikom.csir.co.za To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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