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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).

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Is there a way to use a vpn on one network card, and use a second network card for a regular connection? (lemmy.dbzer0.com)

submitted 5 days ago by [email protected] to c/[email protected]

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I've got a Linux server running Xubuntu at the moment (It was a media player first), and it also runs two Minecraft servers for the family. It has two network cards that are both connected to the internet. Is there a way to bind the VPN to one of the cards and use the other one for regular use?

I've got Surfshark as my VPN, and it doesn't allow port forwarding under Linux. I've got some software that I want to keep behind the VPN, but the lack of port forwarding is stopping me from sharing the Minecraft servers, and when the VPN is active, it slows down the connection to some of my services like Plex.

I've tried to look it up, but I just don't know enough to get myself anywhere. I've found results that talk about name spaces and routing tables, but they assume a level of knowledge that I just haven't got yet.

I want to use the Arr suite and qBittorrent as the main programs behind the VPN, and Plex, Mylar (a comic manager), Syncthing, and Minecraft as the main programs without it. If I set up qBittorrent and the Arrs as Docker containers, can I use Gluetun to bind just them to the VPN? The VPN is using OpenVPN connections if that makes a difference.

Thanks in advance :)

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[–] [email protected] 3 points 2 days ago (1 children)

Yeah, there’s a baseline of network stack understanding that you gotta have in order to use some of the tools, even Theo es that are supposed to make it easier.

What don’t you get? Maybe I can point you in the right direction.

[–] [email protected] 2 points 21 hours ago (2 children)

Thank you :)

The reply from @[email protected] below lead me to the man page for ip netns here:

https://manpages.ubuntu.com/manpages/trusty/man8/ip-netns.8.html

As far as I understand it, I could run programs like this:

ip netns exec vpn ~/qbittorrent/start.sh

ip netns exec clear ~/minecraft/start.sh

but I can't figure out how to get the VPN to only run under the namespace. When I run it now, it reroutes all connections through it. I've got an OpenVPN connection that I've set one of my network connections to connect to automatically, but it doesn't seem to make a difference. As soon as I connect the VPN, everything goes through it.

I'm still reading though, so hopefully I'll figure it out :)

[–] [email protected] 1 points 7 hours ago

I think the defaults on your tunnel apply themselves to all interfaces(or whatever the active one(s) are.

If you wanna troubleshoot this from the ground up you’d start with looking at your routing table.

If you run into problems using the process enumerated in the link you posted a couple of replies down, you can start to troubleshoot it by looking at the routing table with iptables -L

[–] [email protected] 2 points 20 hours ago* (last edited 20 hours ago) (1 children)

https://www.wireguard.com/netns/

Here is a good how to for wireguard. Most commercial VPNs let you connect directly with wireguard.

Basically crate the interface in your clearnet namespace and then move it to your vpn namespace

[–] [email protected] 2 points 20 hours ago

Thanks for replying :)

I think I'm getting it, but my brain is definitely pickled at this point :D

I've also found this post and a Stack Exchange thread to go with it, and it's sinking in slowly

https://schnouki.net/post/2014/openvpn-for-a-single-application-on-linux/

I need to go to bed for the night though, I've just realised that it's gone 3 am :o