From: cmv@looney.att.com (Craig M. Votava)
Subject: Running SLIP on Amiga Unix 2.1
Organization: AT&T Bell Laboratories
Date: Wed, 26 Aug 1992 23:13:33 GMT

Folks-

I just thought I'd post my recent experiences with getting a SLIP connection
up and running with Amiga Unix 2.1 (Amiga Version 2.1p2a) over 2 Telebit
Qblazer modems to an AT&T 750X X-windows terminal (now an NCR product).

I have my amiga at work hooked up to our building ethernet, and decided that
I wanted SLIP from home. So I looked at available modems, and decided that
the Telebit Qblazer V.32/V.42/V.42bis modem (running at speeds up to 38,400)
for $299.00 was the best deal around, so I bought 2 of them. Next, I got an
old 750X terminal from our terminal graveyard, that was not in use. Finally,
I had to do a whole bunch of learning to get everything to work properly.
Here's a summary of what I did.

1.) Connected 750 to A3000 with a direct RS-232 cable.

2.) Uncommented the following lines from /etc/inet/network-config

=============================================================================
/usr/sbin/slink addslip /dev/sld0 sl0

/usr/amiga/bin/slattach 38400 looney.ih.att.com terminal.ih.att.com < /dev/term/ser &
=============================================================================

3.) Uncommented the following line from /etc/inet/inetd.conf
=============================================================================
tftp dgram udp wait root /usr/sbin/in.tftpd in.tftpd -s /tftpboot
=============================================================================

4.) Put a bunch of configuration files for the 750 into the /tftpboot directory

5.) Setup the 750 terminal with a network address for our building network.

6.) Rebooted the A3000, and powered up the 750.

At this point I was able to telnet into the A3000 from the 750 terminal with
no problems, but I couldn't talk to the rest of the building network. After
a LOT of bad words, and much help from smart people, we finally figured out
how to make this second part work. Here, I'll show how to do it, but I won't
explain much what is happening. Maybe someday I'll have time, but not now.

1.) Setup the 750 terminal so that the A3000 is designated as the "gateway"

2.) Execute the following command to add a "proxy-ARP" entry into the ARP table
	on the A3000
=============================================================================
$ arp -s terminal.ih.att.com  0:80:10:0:13:77 pub

	where the colon delimited number is the HEX ethernet (not IP) address
	of the A3000.

To verify this, you can use the following command:

$ arp -a
terminal.ih.att.com (135.1.13.234) at 0:80:10:0:13:77 permanent published
=============================================================================

Once this was all setup properly, I was able to access (ping, telnet, etc) any
host on our building network "directly" from the 750 terminal.

Finally, I was able to remove the direct connect, and insert the modems into
the loop, and try things that way. The speed was slightly degraded (the modems
can go at 38,400 ideally, but I suspect the average throughput is somewhat
less), but it was still very usable for the stuff I want to do.

Thanks goes to the WONDERFUL CBM Unix development team that decided to put this
SLIP stuff onto the tape, with all of the commented out "activation" lines
already in the appropriate files. Good job! This really made things easy for
me.

Comments and Questions are welcome!

-Craig

	()_()	Craig Votava
	 (_)	AT&T Bell Labs, Naperville IL
		cmv@looney.att.com
Newsgroups: comp.unix.amiga