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To: Takeshi Kodama <kodama@flab.fujitsu.co.jp>
Cc: Kernel Mailing List <linux-kernel@vger.kernel.org>
Subject: Re: Why doesn't kernel store ICMP redirect in the routing tables? 
In-Reply-To: Your message of "Thu, 30 Jan 2003 14:36:30 +0900."
             <008401c2c821$8af20cf0$c1a5190a@png.flab.fujitsu.co.jp> 
From: Valdis.Kletnieks@vt.edu
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On Thu, 30 Jan 2003 14:36:30 +0900, Takeshi Kodama <kodama@flab.fujitsu.co.jp>  said:

> Is it no matter that it generates ICMP redirect every time flush the route ca
che?  
> 
> Please tell me why kernel has such a specification that doesn't store ICMP re
direct
> in the routing tables.

This is intentional behavior.  Otherwise, if it were entered into the routing
table, it would remain there essentially permanently (unless forced out by
a 'route -f' command or perhaps another ICMP redirect).  In general, if
your default router is telling you to go someplace else, one of two situations
applies:

1) This is a temporary condition caused by a router flap, in which case we
should only cache it, so later we will re-learn a better path.

2) The router is trying to tell you that you should be fixing your routing
table, either by adding static routes or running a full routing protocol.
-- 
				Valdis Kletnieks
				Computer Systems Senior Engineer
				Virginia Tech


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