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MA49513 - LIC-COMM-TCPIP IP FILTER RULES MAY BLOCK LAN CONSOLE

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APAR (Authorized Program Analysis Report)

Abstract

LIC-COMM-TCPIP IP FILTER RULES MAY BLOCK LAN CONSOLE

Error Description

If the Service Tools LAN adapter used for LAN console is sharing
a line description used by TCP/IP, IP filter rules loaded on    
that line can unexpectedly impact inbound IPv4 traffic from a  
LAN console client.                                            
                                                               
Filter rules could be accidentally created that would block both
telnet and LAN console traffic. If this occurs, recovery may    
require a manual IPL and several manual steps.                  
                                                               
Filter rules should not block traffic for the Service Tools LAN
adapter, even when it is sharing a line with the system TCP/IP  
stack.                                                          

Problem Summary

Please see the Error Description section.                      

Problem Conclusion

This problem can only occur for IPv4 and does not occur for    
IPv6. IPv4 processing of received packets within the system    
TCP/IP stack has been updated so that the Service Tools LAN    
interface is not affected by IP filter rules.                  

Temporary Fix

Comments

Circumvention


PTFs Available

R720 MF69573  1000

R730 MF69572  2132

R740 MF69571  2125

R750 MF69570  2104

Affected Modules


         
         

Affected Publications

Summary Information

Status............................  CLOSED PER
HIPER.............................  No
Component.........................  9400DG3TC
Failing Module....................  RCHMGR
Reported Release..................  R750
Duplicate Of......................  




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Document Information

Modified date:
19 July 2022

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