*BSD News Article 90954


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Newsgroups: comp.unix.bsd.freebsd.misc
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From: "John M. Sellens" <jmsellen@watdragon.uwaterloo.ca>
Subject: strange TCP/IP connection problem with PPP in 2.1.5
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Date: Thu, 13 Mar 1997 06:27:53 GMT
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Xref: euryale.cc.adfa.oz.au comp.unix.bsd.freebsd.misc:36974

I'm having a strange problem connecting between two FreeBSD 2.1.5
machines over a PPP link and I'm looking for some help.

I have an ethernet connected machine, and a second machine on a PPP
dialin connection through an Annex terminal server.  I can ping
from either end, but when I try to make a TCP/IP connection via
telnet, rsh or rlogin, the connection doesn't quite work.  The
symptoms seem to be that the Send-Q (from "netstat -a") seems to
build up a little bit:

Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)
tcp        0     37  PPP-dial.telnet        ether1.1043            ESTABLISHED

Proto Recv-Q Send-Q  Local Address          Foreign Address        (state)
tcp        0     27  ether1.uwaterloo.1043  PPP-dial.uwaterl.telne ESTABLISHED

and eventually the connection dies with

    select: protocol failure in circuit setup

(from rsh for example).

I can connect from non-FreeBSD machines just fine.  If I connect both
machines to the ethernet, it works fine.  I've tried 3 different machines,
and two different dialins in various combinations, with the same problems.
It seems to only happen between an ether FreeBSD and a PPP FreeBSD (at
least as far as I can determine).

Any suggestions, similar experiences, or information pointers would be much 
appreciated.

Thanks!

John Sellens
jmsellens@watdragon.uwaterloo.ca