From mboxrd@z Thu Jan  1 00:00:00 1970
From: Mark Perry <rita.co.ltd@googlemail.com>
Subject: Re: load balance [OT?]
Date: Tue, 03 Jun 2008 12:56:39 +0700
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Martin wrote:
> Hello netfilter list!
> 
> #ISP 1
> ip route add $ISP1_NET dev $ISP1_IF src $ISP1_IP table 1
> ip route add default via $ISP1_GW dev $ISP1_IF
> 
> #ISP 2 
> ip route add $ISP2_NET dev $ISP2_IF src $ISP2_IP table 2
> ip route add default via $ISP2_GW dev $ISP2_IF
> 
> #Rules for ISPs
> ip rule add $ISP1_IP table 1
> ip rule add $ISP2_IP table 2
> 
> #Internal LAN and cross reference to the other ISP
> ip route add $LAN_NET dev $LAN_IF table 1
> ip route add $ISP2_NET dev $ISP2_IF table 1
> 
> ip route add $LAN_NET dev $LAN_IF table 2
> ip route add $ISP1_NET dev $ISP1_IF table 2
> 
> #Add isp net in main
> ip route add $ISP1_NET dev $ISP1_IF src $ISP1_IP
> ip route add $ISP2_NET dev $ISP2_IF src $ISP2_IP
> 
> #This should do the trick of balancing
> 
> ip route add default scope global equalize nexthop via $ISP1_GW dev
> ISP1_IF weight 1 nexthop via $ISP2_GW dev $ISP2_IF weight 2
> 
> 
> What actually happens is that traffic is going out only by the first GW
> declared in the first nexthop, and it doesn't care weight nor balance.
> The only chance of making it to go throw the second GW declared is
> shutting down or collapse that interface, so then it goes for the second
> one.
> 
You have requested different weights:

ip route add default scope global equalize nexthop via $ISP1_GW dev
ISP1_IF weight 1 nexthop via $ISP2_GW dev $ISP2_IF weight 2

If you want each to be equal then at least give them equal weights.


-- 
Mark Perry