This is a great guide to iptables:
An In-Depth Guide to iptables, the Linux Firewall
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Tag Archives: iptables
IP Masquerading using iptables
http://billauer.co.il/ipmasq-html.html
The Beginner’s Guide to iptables, the Linux Firewall
https://www.howtogeek.com/177621/the-beginners-guide-to-iptables-the-linux-firewall/