Path: utzoo!utgpu!watmath!clyde!att!ucbvax!VENERA.ISI.EDU!braden
From: braden@VENERA.ISI.EDU
Newsgroups: comp.protocols.tcp-ip
Subject: Re: Dynamic IP address assignment
Message-ID: <8811281830.AA03654@braden.isi.edu>
Date: 28 Nov 88 18:30:37 GMT
Sender: daemon@ucbvax.BERKELEY.EDU
Organization: The Internet
Lines: 19


	
	So the question is, "most", or "all"?  Does the ever-forthcoming Host
	Requirements RFC make reference to this behavior?

I believe that the ARP algorithm presented on (unnumbered!) page 5 of
RFC-826 will cause all ARP entries to be updated with the mapping (Sender
Protocol Address -> Sender Hardware Address) [i.e., (IP addr -> Ethernet
address)] contained in any broadcast ARP request, either Request or
Reply.  Of course, you can thoroughly mess up everyone's cache this way;
after all, such insidious subversion in a benigh cause is the essence of
proxy ARP.

The Host Requirements RFC does not comment upon this, assuming it is
already part of every ARP implemenentation.  It does discuss the
need to cache validation, with timeouts one of the possible methods
that is listed.

Bob Braden