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Date:      Mon, 16 Dec 1996 15:20:22 -0500 (EST)
From:      "Adrian T. Filipi-Martin" <atf3r@cs.virginia.edu>
To:        FreeBSD Questions List <questions@freebsd.org>
Subject:   pppd and "Unknown protocol (0x????) received"
Message-ID:  <Pine.SUN.3.90.961216150509.2282D-100000@stretch.cs.Virginia.edu>

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Hi folks,

	I hope some one has an answer for this one.  I have only just 
recenlty set up a small dial-in modem pool for PPP and I am having some 
wierd problems.  If any one has a really good reference to point me to 
that will do.

	To simplify testing I have a test machine off the local network 
and plugged directly into one of the PPP server's dail-in serial ports. 
Let's call it the client.

	I log in with kermit and then fire up pppd on the server side.  I 
exit kermit and fire up pppd on the client side.  I then pretty quickliy 
start getting "Unknown protocol (0x4465) received" messages on the client 
side.  The number in parenthesises changes randomly.  The server side is 
also logging messages such as "demuxprotrej: Unrecognized Protocol-Reject 
for protocol 17509!".

	The ppp link usually is established, but I am unsure what is 
causing the "Unknown protocol" messages.  Both pppd's are the same 
version (well one is on 2.1.0 and the other 2.2-ALPHA.)  The problem only 
gets worse when I acutally dial-in, but this I suspect could be noisy 
lines. 

	Does anyone know what could be causing this?  Is it bad hardware? 
Both machines have 16550 UARTS (a boca atio6 on the server).  The server 
is a DX2/66 and the client is a P5/120.

	Below are the options files I am using:

client:
	/dev/ttyd0 115200
	debug
	crtscts
	modem
	passive
	domain neuro.virginia.edu
	noipdefault
	defaultroute

server:
	debug
	128.143.244.161:128.143.244.32
	domain neuro.virginia.edu
	netmask 255.255.255.0
	proxyarp
	crtscts
	passive
	modem


thanks,

	Adrian

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