Re: HACMP persistent IP address and default route based on service address

From: Jesper James (jjj_at_rotte.dk)
Date: 09/08/05 

Date: 8 Sep 2005 00:37:02 -0700

Hi,

I think your problem might be related to the way aix creates outgoing
connections. If you have two adapters on the same subnet, aix will
alternate between these when making outgoing connections, so unless you
can bind your application to the service address you will need to open
up for both. In case of a server-only application it should be no
problem.

>>From a HACMP FAQ:

"...in AIX 5.1 multiple interfaces can have a route to the same subnet.
This is sometimes referred to as multipath routing or route striping
and when this situation exists, AIX will multiplex outgoing packets
destined for a particular subnet across all interfaces with a route to
that subnet."

As you really have no control over on which interface your persistent
and service addresses will end up, you will easily end up in this
situation, and have to plan your network setup accordingly.

see:
http://www-03.ibm.com/servers/eserver/pseries/ha/faq5.html

regards,
Jesper James

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