Connectivity Problems Using VARSUBNETTING In
Static Environment
APAR Identifier ...... PQ46571 Last Changed ........ 01/09/13
CONNECTIVITY PROBLEMS USING VARSUBNETTING IN STATIC ENVIRONMENT
Symptom ...... IN INCORROUT Status ........... CLOSED PER
Severity ................... 3 Date Closed ......... 01/06/11
Component .......... 5735FAL00 Duplicate of ........
Reported Release ......... 320 Fixed Release ............ 999
Component Name TCP/IP V2 FOR V Special Notice HIPER
Current Target Date .. Flags
SCP ................... FUNCTIONLOSS
Platform ............
Status Detail: SHIPMENT - Packaged solution is available for
shipment.
PE PTF List:
PTF List:
Release 3A0 : UQ54998 available 01/06/14 (1000 )
Release 320 : UQ54999 available 01/06/14 (1000 )
Parent APAR:
Child APAR list: PQ50059
ERROR DESCRIPTION:
The GATEWAY statement in the TCP/IP server configuration file
has been coded to make use of VARSUBNETTING, but certain
networks cannot be reached. With the GATEWAY statement
entries that follow:
GATEWAY
128.90 = TOK1 DEFAULTSIZE 0.0.252.0 0.0.160.0
128.90 = ETH1 DEFAULTSIZE 0.0.255.0 0.0.244.0
DEFAULTNET 128.190.160.87 TOK1 DEFAULTSIZE 0
hosts on the 128.90.245, 128.90.246, and 128.90.247 networks
cannot be reached. Traces show that outbound packets are
being placed on the ETH1 adapter, instead of the TOK1 adapter
that is associated with the DEFAULTNET entry.
LOCAL FIX:
PROBLEM SUMMARY:
****************************************************************
* USERS AFFECTED: z/VM TCP/IP LEVEL 320 USERS *
****************************************************************
* PROBLEM DESCRIPTION: Incorrect routes chosen when using *
* variable subnets. *
****************************************************************
* RECOMMENDATION: APPLY PTF *
****************************************************************
When using variable subnetting, the routing logic
may choose an incorrect route. This causes packets
to go out the wrong interface.
PROBLEM CONCLUSION:
The FindRoute logic has been changed to check subnet masks
on route matches. If the mask of the 'matching' route is
not equal to the route being tested no match is returned and
the search continues.
FindSubnetRoutesVisitNode, FindSupernetRoutesVisitNode
and FillIpRoutingTree routines have been changed to
handle zero subnet destination addresses.
TEMPORARY FIX:
COMMENTS:
**** PE01/08/21 FIX IN ERROR. SEE APAR PQ51304 FOR DESCRIPTION
MODULES/MACROS: MSTCP TCIPDOW TCPIP TCTREEP
SRLS: NONE
RTN CODES:
CIRCUMVENTION:
MESSAGE TO SUBMITTER:
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