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