(Linux) Split tunneling fails

[3isfee]

Bug report

Describe your environment

• OS name and version: Nobara Linux 37
• IVPN app version: 3.10.23

Describe the problem

Without giving the interface name in this command there is an error when trying to start an application via split tunneling. https://github.com/ivpn/desktop-app/blob/6adeca2f2bd412a361bf6a0ffb9ec63435855519/daemon/References/Linux/etc/splittun.sh#L270

Adding dev ${_def_interface_name} fixes the issue.

Steps to reproduce:

1. Start IVPN
2. Enable Split Tunneling
3. Try to launch an application

Observed Results:

This error occurs: failed to enable Split Tunneling: (exit status 2) Error: Egress device not specified.

Expected Results:

Application launches with split tunneling.

[stenya]

Here's more information about the issue:

• the issue arises on client machines that are connected via IPv6
• the particular Linux distribution is irrelevant. I was able to reproduce the issue on 'Fedora 36'

@gorkapernas The split-tunneling script has been modified. A brief regression test of split-tunneling is required on various Linux distributions.

[stenya]

@gorkapernas v3.11.18

[gorkapernas]

Verified fixed on v3.11.18 and 3.12.0, tested Split Tunnelling on different Linux distributions under the conditions described on: https://github.com/ivpn/desktop-app/issues/287#issuecomment-1649780548

Split Tunnelling seems to be working as expected.

[stenya]

v3.12.0 released