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WendySanarwanto/router_nat.sh

Last active August 12, 2017 12:06
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NAT-ing Wired Local Area Network's Computers to Linux(Ubuntu) Router that is connected to WAN (Internet), so that the Router can share the internet access to Computers connected to the Wired LAN
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router_nat.sh
#!/bin/bash
# Given, `enp6s0` is the Router's LAN interface connected to Wired LAN.
# And `enxfcde56ff0106` is the Router's interface connected to WAN or internet devices (e.g. Phone in Tethering mode, Wireless/USB dongle modem)
# Reference: http://www.nairabytes.net/81-linux/418-how-to-set-up-a-nat-router-on-ubuntu-server-16-04
# Enable NAT on interface enxfcde56ff0106, use enxfcde56ff0106 for outgoing packets
iptables -t nat -A POSTROUTING -o enxfcde56ff0106 -j MASQUERADE
# Forward IP-packets from enxfcde56ff0106 to enp6s0 where there is an established initial request;
iptables -A FORWARD -i enxfcde56ff0106 -o enp6s0 -m state --state RELATED,ESTABLISHED -j ACCEPT
# Forward packages from enp6s0 to enxfcde56ff0106
iptables -A FORWARD -i enp6s0 -o enxfcde56ff0106 -j ACCEPT
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