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Date: Wed, 10 Dec 1997 23:48:41 -0800 (PST)
From: Jaye Mathisen  <mrcpu@cdsnet.net>
To: Open Systems Networking <opsys@mail.webspan.net>
cc: freebsd-hackers@freebsd.org
Subject: Re: TCP problem
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Seems to me I remember somebody saying something about a similar
situation, and it was fixed by changing the MTU to something else...

But I'm a bit fuzzy on it.

Might try searching the hackers archive, seems to me it was Jordan
that sent the original messages.

On Thu, 11 Dec 1997, Open Systems Networking wrote:

> 
> There seem's to be a problem with FreeBSD machines on ppp dialup accessing
> certain web servers running so FreeBSD on the web server.
> 
> Myself and a person in the UK have noticed the same thing.
> 
> The only thing i can see in common is that both of us having this problem
> are dialing into a xylogics annex terminal server.
> 
> 2 example sites that seem to give this problem connecting to are:
> resnet.uoregon.edu (Where Doug White's pages are)
> and www.netcraft.co.uk.
> 
> Going and using lynx on the ISP's shell box works just fine to these
> sites.
> It's something between us and them.
> Which is the term server, and our os.
> 
> I am running FreeBSD-current
> FreeBSD opsys 3.0-CURRENT FreeBSD 3.0-CURRENT #0: Sun Dec  7 19:05:12 CST 1997 
> 
> I have included output of tcpdump below of a request to www.netcraft.co.uk:
> 
> # tcpdump -vv -i tun0 port 80
> tcpdump: listening on tun0
> 00:24:46.459429 port4.idtswe2.idir.net.1307 > www.netcraft.co.uk.http: S
> 374134
> 3599:3741343599(0) win 16384 <mss 536,nop,wscale 0,nop,nop,timestamp
> 395833 0,n
> op,nop,cc[|tcp]> (DF) (ttl 64, id 49789)
> 00:24:46.984205 www.netcraft.co.uk.http > port4.idtswe2.idir.net.1307: S
> 698923
> 250:698923250(0) ack 3741343600 win 16512 <mss 1460,nop,wscale
> 0,nop,nop,timest
> amp 2733943 395833,nop,nop,cc[|tcp]> (DF) (ttl 48, id 57682)
> 00:24:46.984353 port4.idtswe2.idir.net.1307 > www.netcraft.co.uk.http: .
> ack 1
> win 16512 <nop,nop,timestamp 395834 2733943,nop,nop,cc 4306> (DF) (ttl 64,
> id 4
> 9792)
> 00:24:46.987660 port4.idtswe2.idir.net.1307 > www.netcraft.co.uk.http: P
> 1:274(
> 273) ack 1 win 16512 <nop,nop,timestamp 395834 2733943,nop,nop,cc 4306>
> (DF) (ttl 64, id 49793) 
> 
> If more output is needed just ask.
>