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Re: [dhcwg] Re: [mobile-ip] IPv4 Address Conflict Detection

dworley@globespanvirata.com Tue, 05 February 2002 15:13 UTC

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In-reply-to: <200202050532.GAA08761@dumburken.it.kth.se> (message from Gerald Maguire on Tue, 5 Feb 2002 06:32:14 +0100 (MET))
Subject: Re: [dhcwg] Re: [mobile-ip] IPv4 Address Conflict Detection
References: <200202041944.g14JiY026372@scv2.apple.com> <200202050532.GAA08761@dumburken.it.kth.se>
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   From: Gerald Maguire <maguire@it.kth.se>

   I think the idea of probing and waiting _before_ using an address is
   completely wrong. Since it involves waiting for something _not_ to
   happen. The better approach is to detect the conflict -- if there is
   one.

IMHO, detecting address conflicts is not a matter of a single
strategy.  For instance, if there aren't resource limitations, DHCP
clients should check for address conflicts, but DHCP servers should
also.  Hosts should also continuously monitor their interfaces for
evidence of duplicate addresses (e.g., ARPs from other hosts holding
the same address).

Especially because this is the first attempt to formalize address
conflict detection, we should be documenting all methods that are
known to be useful, preferably with notes on their costs and benefits,
and circumstances in which they are known to be particularly useful.

Dale

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