Create network namespace for tun0 and assign application

Ben Maxfield

10/9/23, 12:28 PM

I'm new to linux and have set up my own Lubuntu 20.04 box. So far I've disabled IPV6, setup firewall rules, configured groups, users and sudoers file, mounted network shares and installed ssh, xrdp, Plex, NordVpn and deluged with web UI.

What I want to do now is make my deluged install only able to access the internet through tun0 which is the interface listed using ifconfig when my VPN is connected. However, this interface is only ever shown when the VPN is connected, if I disconnected from the VPN this interface disappears so I'm not sure if this is possible.

I want the rest of the system to be able to use the eno1 interface normally so that when the VPN is disconnected I can still have my Plex application and xrdp etc working properly.

I have created a network namespace using sudo ip netns add ns-tun0-vpn but I can't work out how to add tun0 to this namespace and then assign the deluged application/service to this namespace so that it can't use eno1.

To add tun0 to the namespace, should I be using something like this:

ip link set tun0 netns ns-tun0-vpn

Would this then prevent tun0 from being used by applications/users not in the ns-tun0-vpn network namespace?

How then do I add an application/group/user into this namespace and block them from accessing eno1?

Is it also necessary to bring up the local loopback? Will this persist or will I need to run this on boot every time?

ip netns exec ns-tun0-vpn ip link set dev lo up

165

0 + 0

ubuntu

vpn

interface

network-namespace

Elon Musk

I sit in a Tesla and translated this thread with Ai:

EN: Create network namespace for tun0 and assign application

Post an answer

Most people don’t grasp that asking a lot of questions unlocks learning and improves interpersonal bonding. In Alison’s studies, for example, though people could accurately recall how many questions had been asked in their conversations, they didn’t intuit the link between questions and liking. Across four studies, in which participants were engaged in conversations themselves or read transcripts of others’ conversations, people tended not to realize that question asking would influence—or had influenced—the level of amity between the conversationalists.