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Network Security Firewalls
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PIX / Foundry not responding to ARP requests?

Subject: PIX / Foundry not responding to ARP requests?
Date: Wed, 17 Nov 2004 08:56:46 +1100
Hey Gang,

Interesting one for you...

Have a customer who is experiencing some difficulty with their setup.
There have a pair of PIX firewalls in HA, connected to a pair of Foundry
Server Iron switches with servers connected off the various switch
ports.

Apparently, intermittently, they claim the PIX will not respond to ARP
requests for its own interface connected on that network. As a result,
the servers which are setup to fail over in the event that they can't
ping the default gateway (the PIX's interface) will failover and as a
result, active sessions will be dropped.

We have done rigorous debugging on the PIX and can't seem to see it drop
any ARP requests, and in fact, it responds to every ARP requests within
microseconds. The customer is adamant that it is the PIX, but my guess
is more towards the Foundry Switches.

Has anyone seen a similar setup to this?

Any feedback is appreciated.

Thanks heaps.

Regards,

Jason Ha [CISSP]
Senior Security Engineer,
Security Operations Centre
VeriSign Australia

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