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From Randy Terbush <>
Subject Re: Obscure MTU problem
Date Tue, 26 Mar 1996 00:11:32 GMT
> Hi,
> I've just been investigating a problem with our new Apache based
> webserver where people using dialups with _some_ ISPs were having extreme
> difficulty with our site (intermittently). The symptom at their end was that
> they got connected but then hang indefinitely waiting for the data. At our end
> we see connections for the data sitting at FIN_WAIT_1 with lots of stuff in
> the send queue.
> I seem to have solved this problem by setting the MTU to 512 (default 1500).
> SCO 5 is uses Path MTU Discovery (a lot of implementations use MTU=512 for all
> nonlocal nets) which is probably the cause of the problem. We don't have any
> such problem with a SCO 3 box and an SGI on the same net.
> Any thoughts, anyone?

Are these clients MacTCP clients by chance? I understand that Path Discovery
on this TCP stack sucks.

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