So..
- I download sarge/stable, install minimal system
- apt-get iproute
- do the following commands:
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#adding new routing table
echo "200 isp2" >> /etc/iproute2/rt_tables
# setting up routing tables
ip route add default via <PUB_GW_ISP1> dev eth1
ip route add default via <PUB_GW_ISP2> dev eth2 table isp2
# routing marked packets via table isp2
ip rule add fwmark 5 table isp2
# enable forwarding
echo "1" > /proc/sys/net/ipv4/ip_forward
# nat
iptables -t nat -A POSTROUTING -o eth1 -s <LAN_NET> -j SNAT
<PUB_IP_ISP1>
iptables -t nat -A POSTROUTING -o eth2 -s <LAN_NET> -j SNAT
<PUB_IP_ISP2>
# marking packets from LAN_IP
iptables -t mangle -A PREROUTING -s <LAN_IP> -j MARK --set-mark 5
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and it should work ?