VM TCP/IP Answers ARP Requests Destined For
Other Hosts
APAR Identifier ...... PQ41584 Last Changed ........ 00/11/01
VM TCP/IP ANSWERS ARP REQUESTS DESTINED FOR OTHER HOSTS
Symptom ...... IN INCORRECT Status ........... CLOSED PER
Severity ................... 2 Date Closed ......... 00/09/22
Component .......... 5735FAL00 Duplicate of ........
Reported Release ......... 320 Fixed Release ............ 999
Component Name TCP/IP V2 FOR V Special Notice PE
Current Target Date .. Flags
SCP ...................
Platform ............
Status Detail: SHIPMENT - Packaged solution is available for
shipment.
PE PTF List: UQ45715 UQ45716
PTF List:
Release 310 : UQ47338 available 00/10/04 (0002 )
Release 320 : UQ47339 available 00/10/04 (0002 )
Parent APAR:
Child APAR list:
ERROR DESCRIPTION:
User reports intermittent network Routing problems are
occurring since having applied Proxy Arp support APAR PQ37902.
Sniffer and VM TCP/IP ARP traces show that VM TCP/IP is now
replying to ARP requests for any host for which it has an ARP
entry. The TCPIP server should only answer requests for itself
and the hosts for which it is serving as a proxy.
LOCAL FIX:
PROBLEM SUMMARY:
****************************************************************
* USERS AFFECTED: All users of VM TCP/IP FL310 and FL320 *
* with PQ37902 applied *
****************************************************************
* PROBLEM DESCRIPTION: With PQ37902 applied, VM TCP/IP answers *
* ARP request destined for other hosts. *
****************************************************************
* RECOMMENDATION: APPLY PTF *
****************************************************************
PROXY ARP support added via PQ37902 has a logic error where
ARP request destined for other host is answered by VM TCP/IP.
PROBLEM CONCLUSION:
An additional check is added in ArpIn() procedure in TCARP to
ensure ARP entry is truly intended for VM TCP/IP or its proxy.
TEMPORARY FIX:
COMMENTS:
MODULES/MACROS: MSTCP TCARP TCPARSE TCPIP
SRLS: NONE
RTN CODES:
CIRCUMVENTION:
MESSAGE TO SUBMITTER:
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