arp cache

[declan mckibben]

Hi, whenever I make a new nat rule in fw-1 (on the IP440 platform) I
have to wait ages for our ISP's cisco 3600 (upstream) to update its arp
cache. I don't have access to this and would be beaten badly if i
rebooted the router. What is the default interval for this cache to
update on the 3600 and is there a way of forcing an arp cache flush?

regards

Declan

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