echo 1 >/proc/sys/net/ipv4/ip_forward
ipchains -F
ipchains -A forward -s 10.0.0.1 -j MASQ
ipchains -A forward -s 192.168.0.2 -j MASQ
ipchains -A forward -s 192.168.0.3 -j MASQ
ipchains -A forward -l -j DENY