Re: [LARTC] DGD of upstream routers

From: Chris Picton <chrisp@tangent.co.za>
To: lartc@vger.kernel.org
Subject: Re: [LARTC] DGD of upstream routers
Date: Wed, 14 Mar 2007 12:44:42 +0000	[thread overview]
Message-ID: <1173876282.18504.13.camel@localhost> (raw)
In-Reply-To: <45F03E67.6040604@tangent.co.za>

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Hi all

I have seen the below question asked a few times, but not seen any
answers.  Is this because

1) it is not possible

2) It is really simple and I shouldn't even be asking the question  :)

Can somebody please enlighten me.

Thanks

Chris

On Thu, 2007-03-08 at 18:48 +0200, Chris Picton wrote:
> Hi
> 
> I have read various info, and mailing list archives, but have not found 
> an answer to the following.
> 
> I have a few servers with configurations similar to the following:
> 
> They each have multiple uplinks to the Internet, and a sample config is 
> as follows:
> 
> eth1 is 192.168.0.1, connected to 192.168.0.2
> eth2 is 192.168.1.1, connected to 192.168.1.2
> 
> My default route looks like:
> ip route add scope global equalize nexthop via 192.168.0.2 dev eth1 \ 
> weight 1 nexthop via 192.168.1.2 dev eth2 weight 1
> 
> If one line goes down, I would like the second to be used exclusively 
> until the first comes back up
> 
> However, the IPs 192.168.0.2 and 192.168.1.2 are always available and 
> reachable.   It is the connection past those devices which may drop.
> 
> Do any of the available options or patches take this into account, or do 
> I have to write custom ping scripts to try reach remote hosts via each 
> gateway, and modify the routes if a line appears to be down.
> 
> 
> _______________________________________________
> LARTC mailing list
> LARTC@mailman.ds9a.nl
> http://mailman.ds9a.nl/cgi-bin/mailman/listinfo/lartc
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