Re: multiple providers

From: buck (buck_at_private.mil)
Date: 03/08/05 

Date: Tue, 08 Mar 2005 10:30:35 -0800

On Tue, 08 Mar 2005 15:30:45 +0100, Sébastien Cottalorda
<sppNOSPAM@libello.com> wrote:

>Hi all,
>
>I've seen Linux Advanced Routing & Traffic Control HOWTO concerning the
>"Routing for multiple uplinks/providers" and I'd like to ask you a
>question:
>
>Is it possible to implement such a solution with two links with the same
>provider (and the same ip network) ?
>
> Internet Internet
> | |
>Provider1(IP1/NET) Provider1(IP2/NET)
> \--------------+-------------/
> |
> Router
>
>Sébastien

Be specific:
1) Is IP1/MASK identical to IP2/MASK? If yes, how do you expect to
identify the traffic?
2) What is MASK?
3) How many NICs in Router? Where do they face?

I have never read the docs, but I suspect thay you should research
"ARP flux". You absolutely need to read about policy routing. Your
kernel will need Julian Anastasov's patch. http://www.ssi.bg/~ja/

It is possible to assign identical IPs to more than one NIC. When you
do that, netmasks become critical; you must not be sloppy with them.

I have gathered some links to documentation for traffic shaping and
multipath routing. Don't stop with this though, because there are
surely other sites I haven't yet found.
http://yesican.chsoft.biz/lartc/index.html

My experience: Spent an entire week, finishing last night, setting up
multipath, and that's after having done it once before about a year
and a half ago. Don't expect this to be quick or easy. 

--
buck

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