I'm assuming that you are using the  local.arp file to do this. 
Try to communicate with your Router admin and ask him to place ARP entries in the
router's configuration. This way the router will immediately and always know where to
direct the packet and that is much faster as well.

Spiros

> -----Original Message-----
> From: declan.mckibben@rte.ie [mailto:declan.mckibben@rte.ie]
> Sent: Wednesday, June 28, 2000 2:53 PM
> To: firewalls@Lists.GNAC.NET
> Subject: FW: arp cache
> 
> 
> 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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