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                        TCP/IP-20 Beware File

                             Version 4.0


                              31 May 88


                       TOPS-20 Version 7(21017)





     COPYRIGHT (C)  DIGITAL EQUIPMENT  CORPORATION 1976,  1987, 1988.   ALL
     RIGHTS RESERVED.


     THIS SOFTWARE IS FURNISHED UNDER A LICENSE AND MAY BE USED AND  COPIED
     ONLY IN  ACCORDANCE  WITH THE  TERMS  OF  SUCH LICENSE  AND  WITH  THE
     INCLUSION OF THE ABOVE COPYRIGHT  NOTICE.  THIS SOFTWARE OR ANY  OTHER
     COPIES THEREOF MAY NOT BE PROVIDED OR OTHERWISE MADE AVAILABLE TO  ANY
     OTHER PERSON.  NO  TITLE TO AND  OWNERSHIP OF THE  SOFTWARE IS  HEREBY
     TRANSFERRED.

     THE INFORMATION IN THIS SOFTWARE  IS SUBJECT TO CHANGE WITHOUT  NOTICE
     AND SHOULD  NOT BE  CONSTRUED  AS A  COMMITMENT BY  DIGITAL  EQUIPMENT
     CORPORATION.

     DIGITAL ASSUMES NO RESPONSIBILITY  FOR THE USE  OR RELIABILITY OF  ITS
     SOFTWARE ON EQUIPMENT WHICH IS NOT SUPPLIED BY DIGITAL.

TCP/IP-20 V4.0 Beware File, TOPS-20 7(21017)                    Page 2


                          TABLE OF CONTENTS


        1.0     FUNCTION OF THIS DOCUMENT  . . . . . . . . . . . . . 3
        2.0     BEWARE ENTRIES FOR TCP/IP SUPPORT  . . . . . . . . . 3
        2.1       Internet CI Support  . . . . . . . . . . . . . . . 3
        2.2       Trailer Encapsulation Detection  . . . . . . . . . 3

TCP/IP-20 V4.0 Beware File, TOPS-20 7(21017)                    Page 3
FUNCTION OF THIS DOCUMENT                                    31 May 88


     1.0  FUNCTION OF THIS DOCUMENT

          This document supplements the TOPS-20  manuals  by  pointing
     out hints and potential problems discovered at the last minute.



     2.0  BEWARE ENTRIES FOR TCP/IP SUPPORT

     2.1  Internet CI Support

          Release 7.0 supports the transmission  of  IP  datagrams  on
     both  the  NI and CI.  The low order byte of the internet address
     for the CI interface must be the same as the CI  node  number  of
     the  system.   If  the  low  order  byte  and  the CI node number
     disagree  a  CIPBAD  BUGINF  will  result  and  the  internet  CI
     interface will be disabled.



     2.2  Trailer Encapsulation Detection

          TOPS-20 does not support trailer encapsulated  datagrams  on
     the Ethernet (NI).  Many Unix and Unix-based systems used trailed
     encapsulated datagrams.  If a trailer  encapsulated  datagram  is
     detected  a IPTENC BUGINF will result.  The trailer encapsulation
     detection software uses three portals on the  NI.   This  feature
     can be disabled by patching the word TRLENA to zero.