Date: Tue, 18 May 1999 21:11:47 -0700 From: "Justin C. Walker" <justin@apple.com> To: freebsd-net@freebsd.org Subject: Re: Redirects and expire times Message-ID: <199905190411.VAA00649@walker3.apple.com>
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I don't have a lot of detailed experience with redirects, so I'm kind of flying without a net (so to speak :-}): > From: Wes Peters <wes@softweyr.com> > Date: 1999-05-18 21:03:23 -0700 > To: Jonathan Hanna <pangolin@home.com> > Subject: Re: Redirects and expire times > Jonathan Hanna wrote: > > > > What is the proper way of handling ICMP redirects? I expected > > host routes to be added with an expire time, but apparently > > they are permanent. > > > > I found one old reference to this, but no reply. > > > > > Date: Mon, 11 Mar 1996 15:09:15 -0600 (CST) > > > From: Scott Mace <smace@metal.neosoft.com> > > > To: hackers@freebsd.org > > > Subject: Redirects and expire times... > > > Message-ID: <199603112109.PAA15480@metal.ops.neosoft.com> > > > > > > I think it is a bug to add a host route after receiving a ICMP redirect > > > and NOT having any expire set on the route. If you have a default routed > > > host in a complex topology you can get into trouble when the topology changes. > > I agree. At Xylan, we had numerous customer complaints about redirects > filling the routing table and the only way to clear them (4.2 BSD based > stack) was to reboot the switch. We added a 10-minute timeout on all > redirect routes, figuring that redirects SHOULD be the exception rather > than the rule. YMMV. We've had no customer complaints since then. ;^) Seems to me that redirects would be used for a variety of reasons: (1) bad configuration; (2) multiple subnets on a single "wire" [so a router *might* want to use redirects to avoid duplicating traffic on the wire]; and mobility. If so, none of these seem to be especially "exceptions", but more like "rules". Regards, Justin -- Justin C. Walker, Curmudgeon-At-Large * Institute for General Semantics | Manager, CoreOS Networking | Men are from Earth. Apple Computer, Inc. | Women are from Earth. 2 Infinite Loop | Deal with it. Cupertino, CA 95014 | *-------------------------------------*-------------------------------* To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-net" in the body of the message
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