Date: Wed, 9 Apr 2003 18:50:17 -0700 From: "Michael K. Smith" <mksmith@noanet.net> To: "'FreeBSD Questions'" <freebsd-questions@freebsd.org>, "'Vincent Zee'" <basics@zenzee.cistron.nl> Subject: RE: Strange network behaviour Message-ID: <000001c2ff03$8b6bae70$5d015140@MKSSONY> In-Reply-To: <44of3fv21k.fsf@be-well.ilk.org>
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Vincent Zee <basics@zenzee.cistron.nl> writes: > I am really at a loss at the moment. >=20 > I have a 100baseT network at home and all connected machines have = 100Mb=20 > network cards. > When I upload mp3 files from my ibook to the FreeBSD server the speed=20 > drops to 100kb/s. >=20 > This only happens between these two particular machines. These same=20 > machines connected to other machines give the expected transmission=20 > speeds. I checked cables, switches and router but found nothing=20 > unexpected. >=20 > Any hints, ideas or even solutions are most welcome. >=20 > The FreeBSD machine is running 4.7 and the ibook 10.2.4 This sounds a lot like a duplex mismatch.=20 Check the collision count. Hi: I'm experiencing the same issue from a PowerMac 733 with OS 10.2.4 = (which is, to my mind, pretty FreeBSD like) to several different FreeBSD = machines running 4.5 and 4.7 respectively. I know there aren't any duplex = problems and I'm not experiencing the issue when I go from either the Mac or = FreeBSD boxes to other hosts. In doing a TCP dump it looks like packet loss, although it only occurs between these hosts. The ack is sent by the Mac but the BSD box doesn't = see it, so the Mac re-acks (up to 4 times usually) before the BSD box acks = the ack at the end of its Window. Everything slows to a crawl until that = one dropped packet is acked. Hrmm. Has anyone else seen this? I'm thinking it's an issue on the = Mac side, but who knows. Mike
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