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 From:  "Jonathan De Graeve" <Jonathan dot De dot Graeve at imelda dot be>
 To:  "Robert Goodyear" <me at jrob dot net>
 Cc:  <m0n0wall at lists dot m0n0 dot ch>
 Subject:  RE: [m0n0wall] 1:1 NAT
 Date:  Fri, 4 Nov 2005 11:16:54 +0100
From your manual:

Step Four: Upstream cache
After all is said and done, don't forget to reboot the ISP's router to
flush its MAC address table, and in some cases a phone call to the ISP
to force them to flush their ARP cache is required.

The easy way is to send an icmp echo-request with the source ip of the
ip you added with destination your ISP's router. In this way the system
will relearn the new mac immediately