From owner-freebsd-bugs Wed Oct 2 02:31:39 1996 Return-Path: owner-bugs Received: (from root@localhost) by freefall.freebsd.org (8.7.5/8.7.3) id CAA24108 for bugs-outgoing; Wed, 2 Oct 1996 02:31:39 -0700 (PDT) Received: from spinner.DIALix.COM (root@spinner.DIALix.COM [192.203.228.67]) by freefall.freebsd.org (8.7.5/8.7.3) with ESMTP id CAA24096 for ; Wed, 2 Oct 1996 02:31:23 -0700 (PDT) Received: from spinner.DIALix.COM (peter@localhost.DIALix.oz.au [127.0.0.1]) by spinner.DIALix.COM (8.8.0/8.8.0) with ESMTP id RAA22086; Wed, 2 Oct 1996 17:29:47 +0800 (WST) Message-Id: <199610020929.RAA22086@spinner.DIALix.COM> X-Mailer: exmh version 1.6.7 5/3/96 To: Rowan Crowe cc: David Greenman , bugs@FreeBSD.ORG Subject: Re: Possible low level TCP bug In-reply-to: Your message of "Wed, 02 Oct 1996 18:40:33 +1000." Date: Wed, 02 Oct 1996 17:29:47 +0800 From: Peter Wemm Sender: owner-bugs@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk Rowan Crowe wrote: > > On Tue, 1 Oct 1996, David Greenman wrote: > > > >The behaviour is this: seemingly small amounts of complete data (ie: a > > >line on IRC) are split into two packets, and are sent about a second > > >apart. The trace from my current router (not a FreeBSD box) shows this > > >behaviour. Note the first packet has the PSH attribute. > > > > What kind of ethernet card are you using? ...or is this with PPP or SLIP ? > > Hello David, > > Don't laugh: I use 3c501 ethernet cards. The capture I sent to you was > carried over the ethernet from my FreeBSD box. However, I doubt that's > the problem, as I've observed inbound data (via serial/PPP) with this > same quirk. Hmm, I wonder if we're running into the (pre-pathmtu) 576 default tcp mss somewhere with the extra tcp headers? > Being new to FreeBSD I'm going to ask what might be a stupid question, > but is it possible to trace IP packets coming in and out of my FreeBSD > box, on the box itself? Yes, check out the tcpdump manual page, as well as ports/net/trafshow. > Cheers. Cheers, -Peter