Re: Round Robin Load Balancing

[Ramin Dousti <ramin@cannon.eng.us.uu.net>]

On Thu, Jul 31, 2003 at 10:48:53AM -0400, Javier Govea wrote:

> Hi guys,
> 
> Well I tried to use the "nth" patch in the mangle table in both the FORWARD and PREROUTING
> chains and still no success. My browser still cannot surf internet, it just waits and
> eventually times out. The rules i tested are below, please correct them if they are wrong.
> 
> Any more suggestions??? any other ideas????

Yes. CONNMARK the conn's and route them accordingly:

iptables -t nat -A POSTROUTING -o ppp0 -j SNAT --to-source <ppp0-ip-addr>
iptables -t nat -A POSTROUTING -o ppp1 -j SNAT --to-source <ppp1-ip-addr>
iptables -t nat -A POSTROUTING -o ppp2 -j SNAT --to-source <ppp2-ip-addr>
iptables -t nat -A POSTROUTING -o ppp3 -j SNAT --to-source <ppp3-ip-addr>

iptables -t mangle -A PREROUTING -m nth --every 4 --packet 1 -m state --state new  -j CONNMARK --set-mark 1
iptables -t mangle -A PREROUTING -m nth --every 4 --packet 2 -m state --state new  -j CONNMARK --set-mark 2
iptables -t mangle -A PREROUTING -m nth --every 4 --packet 3 -m state --state new  -j CONNMARK --set-mark 3
iptables -t mangle -A PREROUTING -m nth --every 4 --packet 0 -m state --state new  -j CONNMARK --set-mark 4

iptables -t mangle -A OUTPUT     -m nth --every 4 --packet 1 -m state --state new  -j CONNMARK --set-mark 1
iptables -t mangle -A OUTPUT     -m nth --every 4 --packet 2 -m state --state new  -j CONNMARK --set-mark 2
iptables -t mangle -A OUTPUT     -m nth --every 4 --packet 3 -m state --state new  -j CONNMARK --set-mark 3
iptables -t mangle -A OUTPUT     -m nth --every 4 --packet 0 -m state --state new  -j CONNMARK --set-mark 4

iptables -t mangle -A POSTROUTING -m connmark --mark 1 -j ROUTE --oif ppp1
iptables -t mangle -A POSTROUTING -m connmark --mark 2 -j ROUTE --oif ppp2
iptables -t mangle -A POSTROUTING -m connmark --mark 3 -j ROUTE --oif ppp3
iptables -t mangle -A POSTROUTING -m connmark --mark 4 -j ROUTE --oif ppp0

Haven't had the chance to test it, though.

Ramin