two router connected to the internet

Hello,

i have two router connected to the internet and i want to send my tcp connection between them.

this is my iptables script :

############################################################################

iptables -t mangle -N INTERNET
iptables -t mangle -N INTERNET_ROUTER_1
iptables -t mangle -N INTERNET_ROUTER_2

#le paquet est t'il en direction d'internet
iptables -o eth2 -t mangle -A POSTROUTING -p tcp -d ! 10.0.0.0/8 -j INTERNET

iptables -t mangle -N INTERNET
iptables -t mangle -A INTERNET -j CONNMARK --restore-mark

# 50 % connection vers router 1
iptables -t mangle -A INTERNET -m mark --mark 0 -p TCP --tcp-flags ALL SYN -m random --average 50 -j MARK --set-mark 1 iptables -t mangle -A INTERNET -m mark --mark 1 -j CONNMARK --save-mark
iptables -t mangle -A INTERNET -m mark --mark 1 -j INTERNET_ROUTER_1

# le reste vers router 2
iptables -t mangle -A INTERNET -m mark --mark 0 -p TCP --tcp-flags ALL SYN -j MARK --set-mark 2
iptables -t mangle -A INTERNET -m mark --mark 2 -j CONNMARK --save-mark
iptables -t mangle -A INTERNET -m mark --mark 2 -j INTERNET_ROUTER_2

iptables -t mangle -A INTERNET -j RETURN

iptables -t mangle -A INTERNET_ROUTER_1 -j ROUTE --gw 10.0.2.200 iptables -t mangle -A INTERNET_ROUTER_2 -j ROUTE --gw 10.0.2.254
############################################################################

it seems that i have a problem with CONNTRACK marking, i don't retreive the mark to route correctly the packets.

My config is kernel 2.6.11.10 with iptables 1.3.1 and last pom.

Thanks for help

If I seen right, then there is a "multipath equal cost Round Robin" method in 2.6.12-rc4 which does this at the routing level, so it would not require you to do at the netfilter level.

Jan Engelhardt

I don't want to do equal Round Robin, my isps hasn't got the same weight, and i have only one interface to connect to the router. I have found script on the net but for as many interfaces as routers. (I can't had an other interface it's an embedded system)

There's also a "weighted round robin" option ;-)

Jan Engelhardt