PROXYARP Does Not Work in Guest LAN Environment
APAR Identifier ...... PQ80577 Last Changed ........ 04/02/09
PROXYARP DOES NOT WORK IN GUEST LAN ENVIRONMENT
Symptom ...... IN INCORROUT Status ........... CLOSED PER
Severity ................... 3 Date Closed ......... 04/02/05
Component .......... 5735FAL00 Duplicate of ........
Reported Release ......... 430 Fixed Release ............ 999
Component Name TCP/IP V2 FOR V Special Notice
Current Target Date .. Flags
SCP ...................
Platform ............
Status Detail: PACKAGING - Solution is being packaged for
shipment.
PE PTF List:
PTF List:
Release 430 : PTF UQ84865 not available yet
Release 440 : PTF UQ84866 not available yet
Parent APAR:
Child APAR list:
ERROR DESCRIPTION:
User is trying to use PROXYARP on a system for which a HIPER
Guest LAN has been defined. Connectivity cannot be achieved
between any of the hosts on the Guest LAN and any hosts on the
real network. A review of the GATEWAY statements indicates
that all statements appear to be correct. The PROXYARP support
function does not appear to be working for this environment.
LOCAL FIX:
PROBLEM SUMMARY:
****************************************************************
* USERS AFFECTED: Users of proxy ARP with multiple real or *
* guest QDIO or Hipersockets LANs *
****************************************************************
* PROBLEM DESCRIPTION: *
****************************************************************
* RECOMMENDATION: APPLY PTF *
****************************************************************
Proxy ARP support was intended to be used to allow IP addresses
within a subnet of a LAN to be used for point-to-point
connections, in effect allowing the hosts at the other end of
the point-to-point connections to appear to be on the LAN by
virtue of the VM TCP/IP stack acting as their proxy to respond
to ARP requests for their IP addresses. With guest (and real)
QDIO or Hipersockets LANs, the ARP function is performed by the
adapter and thus any IP addresses to be proxied must be reported
to the adapter. In order to allow VM TCP/IP to receive traffic
for one LAN via another, the first LAN's IP addresses must be
advertised on the second. Proxy ARP support does not perform
this function.
PROBLEM CONCLUSION:
Support for proxy ARP has been extended to allow hosts on a QDIO
or Hipersockets LAN for which static host routes are defined to
be proxied on other LANs. In addition to specifying PROXYARP in
the ASSORTEDPARMS statement, the GATEWAY statement must be used
to define static routes for hosts on the QDIO or Hipersockets
LAN for which proxy support is required.
For example, if a LAN named ETHERNET is defined with a home
address of 9.115.33.214, three hosts on a QDIO guest LAN named
GESTLAN with home addresses in the same subnet as ETHERNET could
be defined as follows:
HOME
9.115.33.214 ETHERNET
9.115.33.214 GUESTLAN
; Routing information (if you are not using the ROUTED server)
GATEWAY
; Network 1st hop Link MTU Subn mask Subn value
9 = ETHERNET 1500 0.255.255.0 0.115.33.0
9.115.33.215 = GUESTLAN 1500 HOST
9.115.33.216 = GUESTLAN 1500 HOST
9.115.33.217 = GUESTLAN 1500 HOST
; Default for everything else
DEFAULTNET 9.115.33.254 ETHERNET 1500 0
TEMPORARY FIX:
COMMENTS:
MODULES/MACROS: MSTCP TCARP TCMIB TCPIP TCTOOSD
SRLS: NONE
RTN CODES:
CIRCUMVENTION:
MESSAGE TO SUBMITTER:
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