From owner-freebsd-hackers  Thu Dec 11 02:41:30 1997
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To: "Jordan K. Hubbard" <jkh@time.cdrom.com>
cc: Jaye Mathisen <mrcpu@cdsnet.net>,
        Open Systems Networking <opsys@mail.webspan.net>,
        freebsd-hackers@FreeBSD.ORG
Subject: Re: TCP problem 
In-reply-to: Your message of "Thu, 11 Dec 1997 01:38:28 PST."
             <25886.881833108@time.cdrom.com> 
From: David Greenman <dg@root.com>
Reply-To: dg@root.com
Date: Thu, 11 Dec 1997 02:44:27 -0800
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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...
>
>That was me, over my ISDN line (which goes ed0<->sl0<->ed0<->outside),
>and I "fixed" it by setting the MTU on the sl0 device to 1500.  Before
>that, I couldn't look at places like www.sunlabs.com.  David and I
>talked about it for quite awhile and looked at some tcpdump output,
>but we never could figure it out.

   We didn't? I thought we determined that this was caused by the remote
machine not getting the ICMP would-fragment messages that your router was
returning?

-DG

David Greenman
Core-team/Principal Architect, The FreeBSD Project