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From: mrc@cac.washington.edu (Mark Crispin)
Newsgroups: comp.sys.next
Subject: notes for people installing NeXT SLIP
Message-ID: <1991Jun27.071351.17884@milton.u.washington.edu>
Date: 27 Jun 91 07:13:51 GMT
Sender: mrc@milton.u.washington.edu (Mark Crispin)
Organization: University of Washington, Seattle
Lines: 43


     I recently got Louis Mamakos' port of Dial-UP IP for the NeXT
working between my office cube and home slab.

     Here are a few notes that may be useful for someone else:

     1) Have a thorough understanding of your IP connectivity
configuration.  This issue is too complex to go into here, but
briefly, you need to have sketched out what you have since you will
have to make adjustments based on what you have.

     2) Your modems *must* be hardware flow controlled.  This means no
Mac modem cables.  If you haven't done so already, call NeXTConnection
(1-800-800-NeXT) and order a pair of NeXT modem cables from them.  At
$15/each, that's cheaper than most places sell Mac modem cables.
NeXTConnection is pricey in most of their other stuff but this is a
good deal.

     I made the mistake of thinking I could win with Mac modem cables
and disabling XON/XOFF.  I had amazing problems which were clearly due
to buffer overruns.  NeXT modem cables and using /dev/cufa /dev/ttydfa
cured the lossage.

     3) To make sure the slip line is seen by anyone else, make sure
that the gateway machine is running routed with the -s option.  The
NeXT-supplied /etc/rc does not specify -s so you will need to add it.

     4) I found that the the receiving (dudisc) end didn't work the
way the scripts expected.  The scripts expect the string "Dialup IP
connected" to appear after sending the password, but dudisc doesn't
output it (at least it doesn't on my two systems and `strings' didn't
find it).  To work around this, I put together this little hack, which
should be built and run as the login shell instead of the hard links
created by `duinstall':

#include <stdio.h>

main (int argc,char *argv[],char *envp[])
{
  char *nargv[] = {"dudisc_slip0",0};
  puts ("Dialup IP connected");
  execve ("/usr/dialupip/bin/dudisc",nargv,envp);
}