Heres Cisco's definition.
http://www.cisco.com/warp/public/105/5.html
Brian "Sonic" Whalen
Success = Preparation + Opportunity
On Wed, 23 May 2001, Chuck Larrieu wrote:
> At the risk of becoming another Bob Vance......
>
> I'm reading Doug Comer's TCP/IP reference, on the assumption that it can't
> hurt to really get into how TCP/IP works.
>
> Proxy-arp versus normal arp.
>
> A host does not know the physical address of another host so it sends out
an
> ARP request. If the host in question lies on another network, a router
> responds to that request. Proxy ARP, correct?
>
> A host through it's TCP stack does the XOR and determines that a host lies
> on another network. The host therefore sends the packet to the device
> indicated as its default gateway in its configuration. It sends an ARP
> request for the MAC of the default gateway. Normal ARP?
>
> So in other words, proxy arp may be viewed as something of an obsolete
> protocol / operation in that most modern TCP stacks contain the mechanisms
> for doing the network XOR determination, and then using the default
gateway.
> A modern stack would recognize that a host is on a different network and go
> the default gateway route, so to speak.
>
> In other words, the necessity for proxy arp is eliminated for the most part
> because of the default gateway concept and the modern TCP stack.
>
> Has it sunk through this thick head finally?
>
> PS Comer states that proxy arp is aka arp hack. :->
>
> Chuck
>
> One IOS to forward them all.
> One IOS to find them.
> One IOS to summarize them all
> And in the routing table bind them.
>
> -JRR Chambers-
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