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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
And one doesn't even need two NICs, right.
One NIC is fine
yeah, VLAN interfaces and other kinds of virtual interfaces can also be used. I think you can even have multiple "sub interfaces", that will receive distinct IPs from the local DHCP server
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 >.<
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
Yes you can!
As you said, it’s got everything to do with routing and you don’t know how to do that yet.
Now’s a great time to learn!
If you’re on a time crunch, go ahead and use network namespaces under network manager to set up something like what you want as another user suggested.
If you have time to learn about the firewall and routing table rules, put on your wire rim sunglasses, pop a jungle cd in and crack open Linux Firewalls or some such book for nerds.
If you’re on a time crunch, go ahead and use network namespaces under network manager to set up something like what you want as another user suggested.
Is there a way to do this without NetworkManager?
I have only used them with network manager, but according to the manual it seems possible to use them free of network manager, and maybe even systemd!
That's amazing, I'm gonna have to dig a little deeper into that
If you’re on a time crunch, go ahead and use network namespaces under network manager to set up something like what you want as another user suggested.
I'd love to, but I have no idea how >.< :D
I have a vague idea of what they are and what they do, but everything I've found assumes a level of understanding that I don't have yet. I've found this man page from searcing an example posted in another reply, and it's helped, but I'm still confused :)
https://manpages.ubuntu.com/manpages/trusty/man8/ip-netns.8.html
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.
Thank you :)
The reply from @jet@hackertalks.com 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 :)
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
Sorry, I forgot to reply sooner >.<
I've been trying to get my head around this and also looking into Docker containers with Gluetun, as that looks a bit easier to start with. I think for the moment I'm going to go down the Docker route, and at least get the bulk of the programs separated, and give myself some breathing space to learn a bit more.
Docker isn't ideal, as not everything has a Docker version, but the main programs that I originally mentioned do, and it will let me open the Minecraft servers to the kids in the extended family, especially as it's getting colder and darker here.
I just want to say thank you to you, @jet@hackertalks.com, @lungdart@lemmy.ca, and everyone else who's helped :)
I'm not giving up on this, I'm just going a bit more towards the basics and learning to walk before I try to run. This switching from Windows malarkey is hard work! ;)
Yes, that's what Gluetun is for. You create a Gluetun container and specify which containers should use it as the gateway in the compose file with:
network_mode: "service:gluetun"
Then you can open a shell in the container and run this to see if the container's IP is different from your own:
curl ifconfig.io
Make sure to try stopping the gluetun container and confirm your other containers lose network access.
There are plenty of guides about this if you search for "gluetun arr stack", like this random one I picked: https://www.smarthomebeginner.com/gluetun-docker-guide/
That has some steps outlining the basic gluetun configuration, how to put specific containers behind it, and test it.
Yes but why?
What's the VPN for?