________________________________
From: Simon Matter <[email protected]>
>
> Exactly, what about the rest of the network, switches/routers, how do they

> know about the FW change? (I guess the easiest solution would be to simply> 
> reboot those devices after the FW change)


Note that I've kept the new FW online for more than 5 minutes.
I'm not sure yet when an ARP entry times out in my network devices (I'll need 
to check on each and every switch firmware), but in Linux it should be about 1 
minute according to:

/proc/sys/net/ipv4/neigh/default/gc_stale_time

I'm only assuming the other network devices have similar settings, but I guess 
I'll need to check thoroughly.

The fact that I can ping from the new FW to any host in any "zone" can be 
explained by the fact that the new FW has an empty ARP table, and when a new 
connection is to be made the dst host replies to the ARP request directly to 
the new FW.
So I guess I can successfully ping from the new FW to host A, but not 
necessarily the other way around.

Thanks,

Vieri

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