[LARTC] Re: LARTC Digest, Vol 20, Issue 7

[Paulo Ricardo Bruck]

> Message: 1
> Date: Fri, 06 Oct 2006 00:06:08 -0400
> From: Kevin White <kwhite at telsource.com>
> Subject: [LARTC] Two upstream gateways, only use one unless it fails?
> To: lartc at mailman.ds9a.nl
> Message-ID: <4525D630.1040401 at telsource.com>
> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> 
> I'm looking at setting up a system with two upstream Internet routers,
> the second to be used only if the first fails.
> 
> There's a lot of information on using Julian's patches (the nano
> document), and I'm still digesting all of it.  It looks pretty slick,
> and I think it will work...but I don't see if I can actually set up
> multipath and have the kernel not use the second interface unless it has
> to.  It looks like I can only set weight and set up a percentage rule.
> 
> Am I missing something?  Can I say "here are two routes, always use
> route one unless you can't?"
> 
> Thanks,
> 
> Kevin


Hi Kevin


You can use multipath with different weights  see below taken from
lartc.org...

############### cute##################
4.2.2. Load balancing
The second question is how to balance traffic going out over the two
providers. This is actually not hard if you already have set up split
access as above. 

 Instead of choosing one of the two providers as your default route, you
now set up the default route to be a multipath route. In the default
kernel this will balance routes over the two providers. It is done as
follows (once more building on the example in the section on
split-access): 

	    ip route add default scope global nexthop via $P1 dev $IF1 weight 1 \
	    nexthop via $P2 dev $IF2 weight 1
	  
This will balance the routes over both providers. The weight parameters
can be tweaked to favor one provider over the other.
####################cute######################

Then you can do something like this:
 ip route add default scope global nexthop via $P1 dev $IF1 weight 100 \
	    nexthop via $P2 dev $IF2 weight 1		    ^^^^^^^^^^	

> ************************************


best regards
-- 
Paulo Ricardo Bruck - consultor
Contato Global Solutions - http://www.contato.com.br
fone 011 5031-4932 011 5034-1732 cel 011 9235-4327
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