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Linux iptables firewall rules to prevent private IP leakage from masquerade/SNAT

Unroutable TCP type packets, from reserved for local use only networks (RFC1918), being sent out to internet on a Linux masquerade box.

See http://www.smythies.com/~doug/network/iptables_notes/index.html

And http://en.wikipedia.org/wiki/Transmission_Control_Protocol#Connection_termination