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Date:      Thu, 13 Feb 1997 22:53:51 -0600
From:      joed@ksu.edu (Joe Diehl)
To:        freebsd-hackers@freebsd.org
Subject:   user-level ppp mtu problems
Message-ID:  <Mutt.19970213225351.joed@marvin.ksu.edu>

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Greetings,

For the past several months I've been having interesting problems with 
my internet link via the user level ppp program.  Essentially any 
connection in which I attempted to send large quantities of data
(ie more than what's generated by an interactive shell) would hang
and enter a state of FIN_WAIT_1.

I spent a little bit of time digging through the code, and came accross
the `set mtu` command.  I assumed then that this command would override
the MTU setting.  But to no avail, the connections didn't work.

In the end my problems are mostly a problem with our ciscos; however,
there seems to be a logic problem in so far as I couldn't overload the MTU
setting to something other than the MRU reported by the ppp server.

As much as I'd like to spend sometime digging through the source code
to fix it myself, I simply don't have the time right now.  For the time
being a simple hack to one of the header files resetting the MAX_MRU
and DEF_MRU to 552 has solved my problem.

Danke

---
Joe Diehl <joed@ksu.edu>
PGP Key: finger joed@unix.ksu.edu



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