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LemonadeLlama
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PostPosted: Thu Jun 06, 2024 9:17 am    Post subject: Using a VPN to play LAN games Reply with quote

Hey everyone.

I have some friends who play LAN games together on Windows using Radmin VPN.
I would like to join them, but I understand that Radmin VPN is unavailable on Linux.

I am looking into using Wireguard as an alternative, but I have seen conflicting reports online of the success of doing this.

This reddit thread seems to imply that you can't use them together because Wireguard operates at layer 3 but Radmin VPN operates at layer 2.
This article says you can use Wireguard to play LAN games together, but that doesn't necessarily disprove the reddit thread.

What would be the best option? Is there a Linux VPN that can talk to a Radmin VPN on Windows? Should my friends switch to a different VPN? I'm not sure what I should do here.
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szatox
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PostPosted: Thu Jun 06, 2024 10:25 am    Post subject: Reply with quote

Openvpn.
It runs on windows and linux, it can work with either tun or tap device (forwarding L3 and L2 respectively), and it supports UDP and TCP transports, so you do have a fallback option in case your ISPs stand in the way. UDP is the right choice when available.
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mrbassie
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PostPosted: Fri Jun 07, 2024 4:58 pm    Post subject: Reply with quote

https://download.wireguard.com/windows-client/
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szatox
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PostPosted: Fri Jun 07, 2024 7:37 pm    Post subject: Reply with quote

I don't think WG is capable of forwarding L2 traffic though, which is actually required by some LAN games.
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LemonadeLlama
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PostPosted: Tue Jun 11, 2024 10:06 am    Post subject: Reply with quote

szatox wrote:
I don't think WG is capable of forwarding L2 traffic though, which is actually required by some LAN games.


I think you're right. What I might do is see if I can create an openvpn configuration, then help my friends set it up on their machines.
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LemonadeLlama
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PostPosted: Tue Jun 11, 2024 10:16 am    Post subject: Reply with quote

So from what I can see, it looks like I should be able to set up a configuration to create a TAP device, which will allow everyone playing the same game to receive broadcast traffic for LAN play.
Are there any guides on setting this up? I understand that this is different than conventional VPN configurations.
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szatox
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PostPosted: Tue Jun 11, 2024 10:59 am    Post subject: Reply with quote

OpenVPN is quite old and popular, there are lots of guides.
Yes, TAP device is the way to go. Something like that should do https://openvpn.net/community-resources/ethernet-bridging/

It can automatically allocate dynamic IPs for clients or just provide L2 bridge for integration with other services; you'll also need to make sure client isolation is disabled, I don't know what the default for this option is.
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