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- #!/bin/sh
- PATH=/usr/sbin:/sbin:/bin:/usr/bin
- #
- # delete all existing rules.
- #
- iptables -F
- iptables -t nat -F
- iptables -t mangle -F
- iptables -X
- # Always accept loopback traffic
- iptables -A INPUT -i lo -j ACCEPT
- # Allow established connections, and those not coming from the outside
- iptables -A INPUT -m state --state ESTABLISHED,RELATED -j ACCEPT
- iptables -A INPUT -m state --state NEW -i ! eth1 -j ACCEPT
- iptables -A FORWARD -i eth0 -o eth1 -m state --state ESTABLISHED,RELATED -j ACCEPT
- # Allow outgoing connections from the LAN side.
- iptables -A FORWARD -i eth1 -o eth0 -j ACCEPT
- # Masquerade.
- iptables -t nat -A POSTROUTING -o eth0 -j MASQUERADE
- # Don't forward from the outside to the inside.
- iptables -A FORWARD -i eth1 -o eth0 -j REJECT
- # Enable routing.
- echo 1 > /proc/sys/net/ipv4/ip_forward
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