Re: Equal Cost Multipath (more than one gateway)

From: Jake Anawalt (
Date: Thu Feb 01 2001 - 20:52:21 EST

First off, I apologize for having left the mail client on 'send in html

So, in a nut shell, since a) the isp's are not going to be peering with
me and b) the gateway devices themselves aren't supported to give me
even their status, I need to implement some route checking scripts to
add or remove the bad default gateway if it happens to go down? Is my
line of thinking correct, or am I missing some information about how
osfp/rip enabled programs work, or is there another tool available to do

Jacob Anawalt

----- Original Message -----
From: "Andi Kleen" <>
To: "Jake Anawalt" <>
Cc: "Linux tcp" <>
Sent: Thursday, February 01, 2001 12:03 PM
Subject: Re: Equal Cost Multipath (more than one gateway)

> Try pressing return every 80 characters. It makes your mails more
> On Thu, Feb 01, 2001 at 11:53:02AM -0700, Jake Anawalt wrote:
> > I am about to add a second gateway routing entry to a RH7.0 box,
that appears to have a 2.2.16 kernel with equal cost multi path and
advanced routing options compiled into it. The box does not have rip,
gated, or any other route checking program running on it. The two links
to the internet go out through different ethernet cards, hubs, then
gateway devices. The gateway devices as far as I am concerned are dumb
devices that dont know if they are working or not.
> >
> > How will the 2.2 kernel's routing tables and the round robin affect
of equal cost multi path handle the possibility of either the gateway
device, or some other upstream link failing?
> It won't, it needs an OSPF or similar daemon that downs/ups the
> as needed.
> In theory it could use the ARP neighbour reachability information for
> but that isn't implemented. A real routing protocol is more general
> anyways, it is not limited to a single hop.
> -Andi

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