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How to add a default gateway and enable IP forwarding on Ubuntu

Summary

This article show you how to add a default gateway to Ubuntu and how to enable IP forwarding. IP forwarding in this instance is also known at source NAT and allows your Ubuntu machine to act as a router.

How to add a default gateway to Ubuntu Linux

There are two possible way of doing it:

route add default gw 192.168.56.1

or

ip route add default via 192.168.56.1

How to Enable IP Forwarding on Ubuntu

The command to enable IP forwarding is

sudo sysctl net.ipv4.ip_forward=1

To check the setting

sudo sysctl net.ipv4.ip_forward=1

References

 

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