Removing Mullvad causes connection issues in NekoBox

Help
1

I used to use Mullvad for proxying my Internet connections, but lately switched to other protocols using NekoBox. Since I wasn’t using Mullvad anymore, I decided to remove it from my system configuration, but it lead to issues when using NekoBox in TUN mode. Specifically, all Internet connections start to fail after rebuilding the system and restarting NekoBox. This is how it looks like in the log:

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Changing DNS settings in NekoBox doesn’t improve the situation.
nix-info: system: "x86_64-linux", multi-user?: yes, version: nix-env (Nix) 2.18.8, channels(root): "nixos-24.05, nixos-24.05-24.05, unstable", nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos

2

Finally got around to try it again. I looked for clues in mullvad-vpn.nix, and it seems to be an issue with TUNs in general. Here’s a diff that made it work for now:

- services.mullvad-vpn.package = pkgs.mullvad-vpn;
- services.mullvad-vpn.enable = true;
+ networking.firewall.checkReversePath = "loose";

Maybe it should be included into nekoray declaration.
Also watch your system logs, NekoBox only filters them in the UI while the proxy core fills them up with info-level messages.