echo > 1 /proc/sys/net/ipv4/ip_forward

ipchains -F

ipchains -X

ipchains -P input ACCEPT

ipchains -P output ACCEPT

ipchains -P forward DENY

ipchains -A forward -s 192.168.0.0/24 -d 0.0.0.0/0 -j MASQ

ipchains -A input -i eth0 -s 0.0.0.0/0 -d 192.168.0.0/24 -j REJECT

ipchains -A input -i eth0 -s 0.0.0.0/0 -d 127.0.0.0/8 -j REJECT