Ubuntu – Configuring Network without Default Gateway

network-manager

I'm trying to connect my desktop and laptop using an ethernet connection. I usually configure network from the command line but this time I decided to give Network Manager a try, so I went to Network Connections, and selected manual IP configuration.

At first I left the default gateway field blank, since I don't need a default gateway. Turned out network manager doesn't let me save the connection unless I enter that field, but entering a phony gateway messes up with my Internet connection. Anyway to do this setup?

Best Answer

I always enter 0.0.0.0 as default GW when I don't really need one.

Actually, if you enter IP and netmask, and never touch the GW field it will automatically fill in 0.0.0.0 as the default GW when you press Save.

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The Gateway should be the IP of the Router, that giving the connection to the Internet. Setting it to 0.0.0.0, won't get you anywhere. One way of finding out your gateway, is using a system that already connected to the internet, and just press Ctrl+Alt+T on your keyboard to open Terminal. When it opens, run the command(s) below:

route

This the output: enter image description here

To add the default gateway, you can use the GUI utility that you have in your question, or from terminal. (in your case)

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First, I used these commands (thanks, Beleriand):

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