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Ubuntu - Networking - Configuration - IP Forwarding

IP forwarding is the ability for an operating system to accept incoming network packets on one interface, recognize that it is not meant for the system itself, but that it should be passed on to another network, and then forwards it accordingly.

Enable Port Forwarding

Uncomment or add this line to /etc/sysctl.conf:

<file bash /etc/sysctl.conf> net.ipv4.ip_forward=1 </code>

Then run:

sysctl -p