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I'm trying to activate ip forwarding at boot-time on my ubuntu core image. I can run the command:

sudo sysctl -w net.ipv4.ip_forward=1

It works. Then I reboot the machine, the forwarding is gone. On ubuntu server I can update the file /etc/sysctl.conf .

This file is "read only" in ubuntu-core.

What is the "prefered" way to add ip forwarding in ubuntu core?

// Micke

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If you have superuser permissions you can edit any file with any permissions. Open /etc/sysctl.conf with your favourite editor (vi, nano etc) find string #net.ipv4.ip_forward=1, remove the leading # symbol, save the changes. And run sudo sysctl -p.

Also, you can reboot your machine to make sure the changes are in place.

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