Re: Summary: Proxy ARP on SUN


Henry Spencer (motsj1!mcdchg!clyde!watmath!utgpu!utzoo!henry@hplabs.hp.com)
13 Aug 88 21:13:10 GMT


In article <In article <972@rlgvax.UUCP> In article <972@rlgvax.UUCP> dennis@rlgvax.UUCP (Dennis.Bednar) writes:
>Could someone please explain what is "proxy arp"?

Proxp arp is when one machine answers an ARP request aimed at another,
giving its own physical address rather than the target's address. I.e.,
"send anything meant for him to me". The main purpose of this is to hide
network partitioning: if the gateway between two physical networks does
proxy ARP on network A for all machines on network B, and vice-versa, the
two networks look like one on the IP level. It's sort of a poor man's
subnetting. The main advantage is that it hides the topology completely
and can be used with hosts that don't do subnetting properly. The main
disadvantage is that it's a special-purpose hack that doesn't work well
in unfavorable circumstances (e.g. complex topologies).

--
Intel CPUs are not defective,  |     Henry Spencer at U	of Toronto Zoology
they just act that way.	       | uunet!attcan!utzoo!henry henry@zoo.toronto.edu



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