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First, turn on ip forwarding: echo 1 > /proc/sys/net/ipv4/ip_forward

Next create iptables rules: /sbin/iptables -t nat -A POSTROUTING -o eth1 -j MASQUERADE /sbin/iptables -A FORWARD -i eth1 -o eth0 -m state –state RELATED,ESTABLISHED -j ACCEPT /sbin/iptables -A FORWARD -i eth0 -o eth1 -j ACCEPT