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 From:  Chris Buechler <cbuechler at gmail dot com>
 To:  Steve Yates <steve at teamits dot com>
 Cc:  "m0n0wall at lists dot m0n0 dot ch" <m0n0wall at lists dot m0n0 dot ch>
 Subject:  Re: [m0n0wall] RE: Upgrading 1.2 to 1.3
 Date:  Sat, 17 Jul 2010 01:53:22 -0400
On Sat, Jul 17, 2010 at 12:38 AM, Steve Yates <steve at teamits dot com> wrote:
> Chris Buechler wrote on Fri, Jul 16 2010 at 8:49 pm:
>
>>>        Well that fails spectacularly too.  When I enable 1:1 NAT using a public IP as
>> the external, and a private IP as the internal, all communication past the ISP's
>> router seems to stop.
>>
>> Likely ARP cache on the ISP's router, and/or missing proxy ARP.
>
>        Maybe but it's not like I was adding new IPs.  Maybe it was just confused over the change
in MAC addresses for the IP?

Not confused, that's the expected behavior when an IP changes MACs,
the ISP router had the previous MAC cached. Default ARP cache timeout
is several hours on most routers (4 hours on Cisco).