On Wed, 23 May 2001, Chuck Larrieu wrote:
> 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.
Correct. Proxy ARP still remains useful when you have say, to split a
400-host ethernet into 4 VLANS. With it active on the router
interface(s), you don't need to reconfigure the hosts' notion of the
mask all at once. I'm not sure why it still defaults to on, though. (Or
does it? It did last time I looked, but that was quitre some time ago.)
> Has it sunk through this thick head finally?
>
> PS Comer states that proxy arp is aka arp hack. :->
IIRC, that's the name it got when someone proposed it as a temporary
workaround at the time subnetting was introduced.
--
"Someone approached me and asked me to teach a javascript course. I was
about to decline, saying that my complete ignorance of the subject made
me unsuitable, then I thought again, that maybe it doesn't, as driving
people away from it is a desirable outcome." --Me
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