Date: Wed, 02 Oct 1996 17:29:47 +0800 From: Peter Wemm <peter@spinner.DIALix.COM> To: Rowan Crowe <rowan@ozramp.net.au> Cc: David Greenman <dg@root.com>, bugs@FreeBSD.ORG Subject: Re: Possible low level TCP bug Message-ID: <199610020929.RAA22086@spinner.DIALix.COM> In-Reply-To: Your message of "Wed, 02 Oct 1996 18:40:33 %2B1000." <Pine.LNX.3.91.961002183806.30318A-100000@ozramp>
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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
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