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MA43735 - LIC-COMM-TCPIP-LOOP SYSTEM HANG

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 APAR (Authorized Program Analysis Report)

Abstract

LIC-COMM-TCPIP-LOOP SYSTEM HANG

Error Description

System locks up after just a couple of users get signed on.    
MSD shows all processors running the same code - #toirhdl      

Problem Summary

System locks up after just a couple of users get signed on.    
MSD shows all processors running the same code - #toirhdl      

Problem Conclusion

When using proxy ARP for a Virtual IP address (VIPA) where the  
VIPA is set as the associated local interface for the physical  
interface addresses, packets sent with the VIPA as the source  
address attempt to prefer routes bound to the VIPA's proxy agent
when selecting from duplicate routes. An error in this route    
selection caused an infinite loop, which is now fixed.          

Temporary Fix

                       *********                                
                       * HIPER *                                
                       *********                                

Comments

When using proxy ARP for a Virtual IP address (VIPA) where the  
VIPA is set as the associated local interface for the physical  
interface addresses, packets sent with the VIPA as the source  
address attempt to prefer routes bound to the VIPA's proxy agent
when selecting from duplicate routes. An error in this route    
selection caused an infinite loop, which is now fixed.          

Circumvention


Setting different route priorities for the duplicate routes will

prevent the loop.                                              

PTFs Available

R710 MF58512 PTF Cover Letter   4143
R720 MF58513 PTF Cover Letter   4276

Affected Modules

         
         

Affected Publications

Summary Information

Status............................................ CLOSED PER
HIPER........................................... Yes
Component.................................. 9400DG3TC
Failing Module.......................... RCHMGR
Reported Release................... R710
Duplicate Of..............................




System i Support

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Document Information

Modified date:
12 November 2014