TCP/IP-20 Beware File
Version 4.0
21 Jun 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 NODE% JSYS Problem With Non-DECnet Monitors . . . 3
2.2 Internet CI Support . . . . . . . . . . . . . . . 4
2.3 Trailer Encapsulation Detection . . . . . . . . . 4
TCP/IP-20 V4.0 Beware File, TOPS-20 7(21017) Page 3
FUNCTION OF THIS DOCUMENT 21 Jun 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 NODE% JSYS Problem With Non-DECnet Monitors
Due to an incorrect calling sequence, unpredictable results
can occur when performing a NODE% JSYS on a monitor built with
TCP/IP but without DECnet. The NODE% code is now in section 6.
It attempts to call routine PARNDU but this routine is in section
1. Since the call is not specifying the section number, the
NODE% code incorrectly calls into random section 6 locations.
The following patch will make NODE% do a CALLX to PARNDU and
get the section right. This is edit 8853 to STG.MAC and will
appear in Autopatch tape 19. Due to the timing of this problem,
this patch is not in the field image version of 7.0. It must be
applied to field image 7.0, STG must be recompiled, and the
monitor relinked with the new STGAN.REL. There are tags which
exist in T20-AN70.CTL which can assist in this process. Tag
ARPBIG will build a "big" TCP/IP monitor without DECnet and tag
ARPMAX will build a "maximum" TCP/IP monitor without DECnet.
Again, this patch only applies to TCP/IP monitors built
without DECnet. This patch will appear in Autopatch tape 19;
the first Autopatch tape based on TOPS-20 version 7.0. So, it
only needs to be applied to the field image version of 7.0. We
apologize for any inconvenience that this may cause.
File 1) GOLD0:[4,103] created: 1355 01-Jun-88
File 2) GSRC0:[4,103] created: 0934 14-Jun-88
1)1 ; Edit= 8851 to STG.MAC on 1-Jun-88 by RASPUZZI
****
2)1 ; Edit= 8853 to STG.MAC on 14-Jun-88 by RASPUZZI
2) ;Make NODE% call PARNDU in the right section when building a non-DECnet
2) ;monitor.
2) ; Edit= 8851 to STG.MAC on 1-Jun-88 by RASPUZZI
**************
1)80 CALL PARNDU ;MAKE SURE NODE NAME IS KOSHER
1) RETBAD() ;FAILED, TELL CALLER WHY
1) MOVEM T2,OURCNT ;REMEMBER LENGTH OF OURNAM
****
2)80 CALLX (MSEC1,PARNDU) ;[8853] Make sure node name is kosher
2) RETBAD() ;FAILED, TELL CALLER WHY
2) MOVEM T2,OURCNT ;REMEMBER LENGTH OF OURNAM
**************
TCP/IP-20 V4.0 Beware File, TOPS-20 7(21017) Page 4
Internet CI Support 21 Jun 88
2.2 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.
2.3 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.