http://www.oreilly.com/openbook/linag2/book/ch11.html
IP Masquerade and Network Address Translation
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http://www.oreilly.com/openbook/linag2/book/ch11.html
http://billauer.co.il/ipmasq-html.html
https://www.howtogeek.com/177621/the-beginners-guide-to-iptables-the-linux-firewall/