Path: utzoo!utgpu!water!watmath!clyde!att!osu-cis!tut.cis.ohio-state.edu!mailrus!uwmcsd1!ig!agate!ucbvax!LARRY.MCRCIM.MCGILL.EDU!philipp
From: philipp@LARRY.MCRCIM.MCGILL.EDU (Philip A. Prindeville)
Newsgroups: comp.protocols.tcp-ip
Subject: Re:  Are there IP-over-PDN X.25 implementations on SunLink X.25?
Message-ID: <8807072233.AA24835@Larry.McRCIM.McGill.EDU>
Date: 7 Jul 88 22:33:59 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 23

Yes, in a nutshell.  The method for transmitting IP packets over
X.25 requires: (a) the User Data field in the Call request contains
0xCC as the first octet and (b) the IP datagrams be sent over the VC
aligned on packet boundaries, with packets greater than the maximum
X.25 PDU being sent as complete-packet-sequences (ie. M bit on for
all but the last packet of the seq).

We use an ACC X.25 card to do this, and we speak to the original
X25net hardware, which is an Interactive Systems (INcard).  I have
heard of people using the SUNlink X.25 S/W (in PDN, *not* DDN
mode) with success.  In fact, SUN has their own internal internet
spanning North America and parts of Europe/Japan using IP over
X.25.

For more information, contact your SUN rep.

As for the Comer/Korb paper, it was published by CSNet.  It is
available via anonymous FTP from sh.cs.net, as the file "dn5"
(or something like that).  I can mail it to you if you need it.

Hope this helps,

-Philip