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From: lepreau@utah-cs.UUCP (Jay Lepreau)
Newsgroups: comp.dcom.lans
Subject: Re: Milking machine performance/function
Message-ID: <4074@utah-cs.UUCP>
Date: Thu, 4-Dec-86 14:55:55 EST
Article-I.D.: utah-cs.4074
Posted: Thu Dec  4 14:55:55 1986
Date-Received: Fri, 5-Dec-86 03:09:53 EST
References: <1612@batcomputer.tn.cornell.edu> <7432@topaz.RUTGERS.EDU>
Reply-To: lepreau@utah-cs.UUCP (Jay Lepreau)
Distribution: na
Organization: University of Utah CS Dept
Lines: 10
Summary: 4.3 does redirects

From "Changes in the kernel in 4.3 BSD":
  When a packet is forwarded using the same interface on which it arrived,
  if the source host is on the directly-attached network, an ICMP redirect
  is sent to the source. If the route used for forwarding was a route to a
  host or a route to a subnet, a host redirect is used, otherwise a
  network redirect is sent. The generation of redirects may be disabled by
  a configuration option, IPSENDREDIRECTS=0.

As Chuck notes, the "proxy arp" code is widely available and easy to
install; one place is from ut-sally in pub/subarp or subarp.shar.