PROXYARP Support Does Not Work When Using
OSA Express Adapter

 
 APAR Identifier ...... PQ51148      Last Changed ........ 01/08/23
 PROXYARP SUPPORT DOES NOT WORK WHEN USING OSA EXPRESS ADAPTER
 
 Symptom ...... IN INCORROUT         Status ........... CLOSED  PER
 Severity ................... 2      Date Closed ......... 01/08/14
 Component .......... 5735FAL00      Duplicate of ........
 Reported Release ......... 3A0      Fixed Release ............ 999
 Component Name TCP/IP V2 FOR V      Special Notice
 Current Target Date ..              Flags
 SCP ...................
 Platform ............
 
 Status Detail: SHIPMENT - Packaged solution is available for
                           shipment.
 
 PE PTF List:
 
 PTF List:
 Release 3A0   : UQ56946 available 01/08/21 (1000 )
 Release 410   : UQ56947 available 01/08/21 (1000 )
 
 Parent APAR:
 Child APAR list:
 
 ERROR DESCRIPTION:
 User installed new OSA Express Adapter and the Linux  systems
 connected to VM via Point to Point connections no longer have
 connectivity out to the network. Tracing the problem showed
 that ProxyArp is not working when an OSA Express Adapter (OSD)
 adapter is being used.
 
 LOCAL FIX:
 Work around is available from VM TCP/IP Support
 
 PROBLEM SUMMARY:
 ****************************************************************
 * USERS AFFECTED: Users of OSA Express in native (QDIO) mode   *
 *                 who also have links to other systems or      *
 *                 guests with IP addresses in the same         *
 *                 subnetwork as the IP address of the OSA      *
 ****************************************************************
 * PROBLEM DESCRIPTION:                                         *
 ****************************************************************
 * RECOMMENDATION: APPLY PTF                                    *
 ****************************************************************
 Proxy ARP support is not effective for OSA Express interfaces
 because the IP addresses for links in the same subnetwork as the
 OSA are not added to the IP address table that VM TCP/IP
 provides to the adapter. Unless the interface is also a primary
 router, traffic for other links is not forwarded to VM TCP/IP by
 the adapter.
 
 PROBLEM CONCLUSION:
 Code has been changed to add IP addresses for hosts in the same
 subnetwork as the OSA to the IP address table when the
 ASSORTEDPARMS PROXYARP option is specified.
 
 TEMPORARY FIX:
 
 COMMENTS:
 
 MODULES/MACROS:   ALLMACRO MSTCP    TCBASEX  TCMIB    TCPARSE
 TCPIP    TCTOOSD  TCTREEP
 
 SRLS:      NONE
 
 RTN CODES:
 
 CIRCUMVENTION:
 
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