If you'd really like to know how many workstations are misconfigured on your
network, ie. incorrect subnet masks, (especially on a large network) turn
off proxy arp. You will probably be surprised at the number of phone calls
received.
----- Original Message -----
From: "ElephantChild"
To:
Sent: Thursday, May 24, 2001 3:58 AM
Subject: Re: ARP versus Proxy-arp [7:5664]
> 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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