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