Re: ICMP Redirect interpretation
From: Barry Margolin (barmar@genuity.net)Date: 04/02/02
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From: Barry Margolin <barmar@genuity.net> Date: Tue, 02 Apr 2002 21:27:28 GMT
In article <944ritpzn4.fsf@foo-bar-baz.cc.vt.edu>,
Valdis Kletnieks <valdis.kletnieks@vt.edu> wrote:
>The other possibility is that *your* end has a borked default route,
>so the following happens:
>
>1) You connect the first time, get assigned an IP address for yourself,
>and get told the OTHER end (ISP end) of the PPP session is nnn.nnn.2.5
>(for example)
>
>2) You add a default route pointing to nnn.nnn.2.5.
>
>3) You get disconnected.
>
>4) You reconnect, get a new IP, and get told the other end of the link
>is nnn.nnn.2.7 now (landed on a different terminal server, perhaps)
>
>5) You send packets to nnn.nnn.2.5, and nnn.nnn.2.7 tells you that you
>should be using the new address instead.
Since the router's IP address doesn't appear in the IP packet, how would
you "send packets to nnn.nnn.2.5" over a serial link? ICMP Redirect only
applies on multiaccess media like Ethernet, where you have link-layer
access to multiple upstream routers.
-- Barry Margolin, barmar@genuity.net Genuity, Woburn, MA *** DON'T SEND TECHNICAL QUESTIONS DIRECTLY TO ME, post them to newsgroups. Please DON'T copy followups to me -- I'll assume it wasn't posted to the group.
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