Path: utzoo!utgpu!news-server.csri.toronto.edu!rpi!usc!apple!salt.acc.com!opal!art
From: art@opal.acc.com (Art Berggreen)
Newsgroups: comp.protocols.tcp-ip
Subject: Re: gateways ignores ICMP redirect
Keywords: ip icmp
Message-ID: <1991May15.155933.11783@salt.acc.com>
Date: 15 May 91 15:59:33 GMT
References: <1991May15.095703@sicsun.epfl.ch>
Sender: news@salt.acc.com
Reply-To: art@opal.acc.com (Art Berggreen)
Organization: Advanced Computer Communications, Santa Barbara, California
Lines: 29

In article <1991May15.095703@sicsun.epfl.ch> goud@sicsun.epfl.ch (Mireille Goud) writes:
>
>
>   Our NSC router (DX4130) does not update its routing table when it
>receives an ICMP redirect message (host redirect or network redirect).
>The ICMP redirect comes from the routers default gateway (on the same
>subnet) and gives the address of a better gateway on the same subnet.
>
>   I dont find anything in the RFCs about what a gateway should do when
>it receives an icmp redirect, but a gateway must be intelligent and
>optimize the traffic on the network...
>   NSC says the ICMP redirect messages are only for hosts.
>
>   Can somebody help me? Thank you.
>
>
> Mireille Goud
> EPFL - SIC
> 1015 Lausanne              goud@sic.epfl.ch

This is pretty normal behavior for current routers.

RFC1009 (and its someday successor) indicate that routers running routing
protocols should NOT respond to Redirects.  The routing protocols should
always provide better information than a Redirect.

Are your gateways communicating via a routing protocol? If not, why not?

Art