Firewall

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This is a basic firewall which works for most Linux distro's. It's based on the Setting up a simple Debian gateway article from debian-administration.org and assumes eth0 to be the external WAN interface and eth1 the internal LAN interface. On Debian based machines, save this script as /etc/network/if-up.d/00-firewall and it will execute whenever the networking starts up.

See also

• dnsmasq