Mark,

You haven't elucidated all the details, so I will assume that the router
has an interface in the same broadcast domain as that of the external
interface of the firewall.

The router will ARP for the IP address associated with that interface
the first time it tries to route traffic to it.

The reason the SPLAT box has got an entry right after bootup is because
the router is probably defined as that interface's default gateway, so
the SPLAT box will ARP for it on bootup assuming that the IP associated
with that router's interface is defined correctly.

Send some traffic from the firewall through the router. If there is no
response, make sure that the router doesn't have another interface in
another network that offers a preferred path back to the source network
of your original traffic and that there are no ACLs on the router that
may be dropping the return traffic. Other possibilities exist, but I
know too little about your setup so there's no point to go into all of
them here.

Utsav



Sheffield wrote:

I am attempting to move a splat R55 (intel) box from our test lab into
production to replace a windows 2000 FP3 box. In the past the normal
procedure has been to clear the arp cache on the router and boot the
firewall. Very shortly after booting the FP3 box, the router arp cache
contains a complete entry for the firewall external interface.

However, with the splat r55 box, the router arp cache never gets updated
with a complete entry for the external interface of the router. The arp
cache on the splat box does get updated with a complete entry for the router
NIC, though.

What needs to be done to allow the router arp table to get updated with a
complete entry for the external interface of a splat r55 firewall?

Thanks in advance for your assistance.

-mark

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