From mboxrd@z Thu Jan  1 00:00:00 1970
From: Zoilo Gomez <zoilo@xs4all.nl>
Date: Tue, 27 Jun 2006 19:15:38 +0000
Subject: Re: [LARTC] load balancing over 4 lines to one provider
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References: <20060627153538.kvtovapugesgk0w0@webmail.fcq.unc.edu.ar>
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To: lartc@vger.kernel.org

Marcos Dione wrote:

>  yes, this is a crazy subject. I have 4 ADSL lines to the same provider, which
>even have the same gateway. Those lines are connected to the same machine (more
>crazyness: even connected to the same nic. it works fine, I swear). this machine
>will serve this conenction to a local net.
>
>  so, I setup the ifaces correctly, everything works. I add balancing using this
>command:
>
># ip route replace default nexthop dev ppp0 nexthop dev ppp1 nexthop dev ppp2
>nexthop dev ppp3
>
>  I try this downloading a iso image using BT and checking with iptraf. the load
>gets balanced. fine.
>
>  then I issue this command to setup masquerading for each ppp line:
>
># for i in 1 2 3 4; do
>  
>
>>sudo iptables -t nat -A POSTROUTING -s 172.16.16.0/22 -o ppp$i -j MASQUERADE;
>>done
>>    
>>
>
>  
>

Have you tried instead:

iptables -t nat -A POSTROUTING -s 172.16.16.0/22 -o ppp+ -j MASQUERADE


?

I do not know the implementation, but perhaps one rule with a '+' makes 
a difference over summing up the 4 individual interfaces.

Interesting setup you have anyway!
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