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 From:  Chris Buechler <cbuechler at gmail dot com>
 To:  Roman Kuznetsov <rk at systola dot de>
 Cc:  m0n0wall at lists dot m0n0 dot ch
 Subject:  Re: [m0n0wall] Server NAT does not work?
 Date:  Mon, 11 Apr 2005 13:16:01 -0400
On Apr 11, 2005 9:18 AM, Roman Kuznetsov <rk at systola dot de> wrote:
> > >
> >
> > It may be the ARP cache on your ISPs routers - some ISPs have
> > unreasonably long TTLs on their ARP caches. If this is the
> > case you will just have to wait for the cache to expire.
> >
> > Or you may also need to add the additional IPs to ARP Proxy (Services
> > -> Proxy ARP).
> Well, it says "you do not need Proxy ARP in most cases".
> And I do not think it has to do with ARP at all:
> I added an alias with ifconfig through /exec.php and it started working
> immediately.
> But, of course, it will be gone after restart.
> So something is not quite right there with that additional IPs on WAN.

And it's proxy ARP, James is right.  Add it.