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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).

Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.

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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 3 weeks 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] 41 points 3 weeks ago* (last edited 3 weeks ago) (18 children)

Yes that's called routing.

You don't bind it to a NIC, you specify the destinations you want forwarded to each interface. Your VPN connection is just another interface.

If you're looking for good docs, you may want to Google split tunnel vpn, and also bone up on your networking.

A few static routes should get you what you need

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

Apologies for the slow reply :)

These are the things that I don't understand. When you say I need to specify the destinations, does that mean the destination of the traffic, like lemmy.dbzer0.com, or the destination network interface like tun0 or enp2s0?

I'm searching for split tunnel VPN, but the majority of results are either sales sites, or Stack Overflow with no confirmed answers.

I've been having a bit more luck with this page after searching for Jet's answer below:

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

but I'm still confused >.<

[–] [email protected] 2 points 2 weeks ago

Routing takes place on layer 3 (ip) so destinations are ip networks and hosts.

Each packet you create has a destination IP. Your computer looks at your route table to see where it goes by matching the destination ip with each network. It will be sent to the most specific match first and your default gateway last.

If you're default gateway is you're vpn server via your vpn interface then you just need to add more specific route for destinations of interest through a different gateway (you're router) via the physical interface

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