*BSD News Article 22826


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Newsgroups: comp.os.386bsd.questions
Path: sserve!newshost.anu.edu.au!munnari.oz.au!news.Hawaii.Edu!ames!elroy.jpl.nasa.gov!swrinde!cs.utexas.edu!utnut!torn!mcshub!todd
From: todd@flex.eng.mcmaster.ca (Todd Pfaff)
Subject: SLIP problems
Message-ID: <1993Oct26.040453.18107@mcshub.dcss.mcmaster.ca>
Sender: usenet@mcshub.dcss.mcmaster.ca
Nntp-Posting-Host: flex1.eng.mcmaster.ca
Organization: McMaster University
Date: Tue, 26 Oct 1993 04:04:53 GMT
Lines: 37

I'm having problems with a SLIP connection between a PC running
386BSD-0.1+pk0.2.4 and a Sun.  I'm hoping someone can help me narrow down
the cause of the problem.

First, the problem:

I can connect the remote Sun, start a SLIP login session, return to my
PC and run slattach, ifconfig and route.  The SLIP link is thus established.
Then I try to ping the Sun.  No response at all.  I reduce the size of the
ping (-s switch) and I finally find that anything larger than 30 receives
no response.  If I do 'ping -s 30' it works, with some lost packets.
Next, I try to telnet or rlogin or ftp.  These all work for a very short
time; sometimes I get logged all the way in, sometimes I don't get past
the login prompt, but it always hangs eventually.  I can kill the hung
process and a subsequent ping of the Sun works so the SLIP link isn't
completely botched.  I can let the ping go forever and it never seems
to hang.

Can anybody pinpoint the cause of these symptoms?

Here is some information that may be useful:

- speed is 9600 bps
- PC only has 16450 UARTs (I'm suspicious of this.  Should I be?)
- sio serial driver
- hardware flow control at the PC end, no XON/XOFF
- connecting to the Sun through a dialup terminal server which I'm quite sure
  is using hardware flow control
- interactive login sessions to the Sun (using Seyon) work fine
- tried uncompressed, auto compress, and uncompressed SLIP with same results
- same results with PPP

-- 
--
Todd Pfaff                       \  Internet: todd@flex.eng.mcmaster.ca
Dept. of Mechanical Engineering   \    Voice: (905) 525-9140 x22902
McMaster University                \     FAX: (905) 572-7944