Path: utzoo!attcan!uunet!snorkelwacker!usc!samsung!umich!terminator!dabo.ifs.umich.edu!rees
From: rees@dabo.ifs.umich.edu (Jim Rees)
Newsgroups: comp.sys.apollo
Subject: Re: subnets, proxy ARP
Message-ID: <1990Jul31.154738.4546@terminator.cc.umich.edu>
Date: 31 Jul 90 15:47:38 GMT
References: <12081@sdcc6.ucsd.edu> <1990Jul30.210655.19558@terminator.cc.umich.edu> <1990Jul31.132558.7841@caen.engin.umich.edu>
Sender: usenet@terminator.cc.umich.edu (usenet news)
Reply-To: rees@citi.umich.edu (Jim Rees)
Organization: University of Michigan IFS Project
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In article <1990Jul31.132558.7841@caen.engin.umich.edu>, jal@acc (John
Lauro) writes:
  When we had an Apollo acting as a router, we ran into problems because
  it didn't support proxy ARP.  If your gateway to the internet doesn't
  support RIP, it makes it hard for computers on the other side of the router
  to access anything outside of your domain...

I don't understand.  You don't give details of your topology, but I can't
imagine any network where proxy arp would be easier to set up or work better
than subnets with RIP (routed).  I'm using routed here, and I don't do
anything to set it up other than turn it on.  Of course it doesn't help that
the sr10.2 routed doesn't work, but you can get a working version from
Apollo (patch 108, timestamp 1-Dec-89).

I also still don't understand why you would need proxy arp if your machines
all understand subnets.  You seem to be saying that you have a routing
problem, but I don't see how proxy arp can possibly help there.  I don't
even see how you could set up proxy arp if you are using subnets.  If the
machine you are trying to arp is on the same subnet, it will just answer by
itself with no need for a proxy.  If it's on a different subnet, the caller
won't try to arp it, it will try to find a gateway.  Did I miss something?