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From: sater@cs.vu.nl (Hans van Staveren)
Newsgroups: comp.protocols.tcp-ip
Subject: Lifetime of routes added by redirects
Message-ID: <3760@sater.cs.vu.nl>
Date: 20 Oct 89 14:52:26 GMT
Organization: V.U. Informatica, Amsterdam, the Netherlands
Lines: 16

I just noticed that on our Suns, running SunOS 4.0.3 dynamically added
routes are kept infinitely. This runs you into problems when gateways
change. Is this up-to-date software behaviour?

A little thought suggested the following protocol to me:

Each dynamically added route(by an ICMP redirect) is aged after a
reasonable time(10 minutes?) and the first packet after the age
is sent to the default router. Any new ICMP redirect for that route
replaces the current one, if no new one comes, when the gateway is down
for example you keep using the old one and try the default route every
say 100 packets.

Does this seem reasonable? Is something like this already in newer software?

	Hans van Staveren, Vrije Universiteit, Amsterdam, Holland