They're using a pretty old IOS, I'd bet. I think the timeout is about 4
minutes. Ask them to do 'ip route cache off' on the interface or
subinterface which faces you.
HTH
Jack Coates, Rainfinity SE
t: 650-962-5301 m: 650-280-4376


On Wed, 28 Jun 2000, declan mckibben wrote:

> 
> 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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