Relay-Version: version B 2.10 5/3/83; site utzoo.UUCP
Path: utzoo!mnetor!uunet!nbires!hao!boulder!sunybcs!bingvaxu!leah!itsgw!nysernic!rutgers!ames!sdcsvax!ucbvax!MATHOM.CISCO.COM!SATZ
From: SATZ@MATHOM.CISCO.COM (Greg Satz)
Newsgroups: comp.protocols.tcp-ip
Subject: DDN X.25 mapping
Message-ID: <12334192173.6.SATZ@MATHOM.CISCO.COM>
Date: Sun, 13-Sep-87 01:01:11 EDT
Article-I.D.: MATHOM.12334192173.6.SATZ
Posted: Sun Sep 13 01:01:11 1987
Date-Received: Sun, 13-Sep-87 19:46:09 EDT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The ARPA Internet
Lines: 7

What should a DDN X.25 interface do about mapping to X.121 addresses
when connected to a class B or C network? I remember seeing something
about this before somewhere. If I remember correctly the C and D octets
should be used for the imp and host octets for class B addresses. For
class C, the upper four bits and the lower four bits of octet D should
be used for the imp and host octets. Is this correct?
-------