This proxy ARP question has arisen a few times recently. For the interest of 
list members who may not understand proxy ARP fully, here's an explanation:
http://www.cisco.com/en/US/tech/tk648/tk361/technologies_tech_note09186a0080094adb.shtml
 
Note that it assumes you understand ARP and Ethernet communication in 
general. If not, see this:
http://www.faqs.org/rfcs/rfc826.html
 
Also, this Wikipedia article:
http://en.wikipedia.org/wiki/Address_Resolution_Protocol

 has a link to this sequence diagram:
http://www.eventhelix.com/RealtimeMantra/Networking/Arp.pdf
 
...which may help people picture how ARP works

Should I write something up, to flesh out the FAQ entry?
-klode

On 4/12/05, Roman Kuznetsov <rk at systola dot de> wrote:
> 
> > 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.
> 
> Yes, it worked!
> I would consider this illogical, but it works.
> 
> Thank you.
> 
> 
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