I'm a long-time Transmission user but I just learned that VPN killswitches are a thing (how did it take me so long!?). I would like to try another client which has this feature in case I forget to launch my VPN client before opening Transmission. Does anybody have any recommendations? Deluge? QBittorrent? Or any others?

UPDATE: Thanks for the suggestions everyone! I decided to give qbittorrent a try and have been enjoying it so far.

I followed these steps to bind it to my VPN from on Linux:

Pause torrents
Connect VPN
Open qBittorrent. Go to Preferences, and then Advanced tab
Change network interface to tun0. If unsure, disconnect VPN and restart qBittorrent then repeat step 1 to see which interface appears.
Restart qBittorrent
Test it out on the official kubuntu torrent or your favourite distro from LinuxTracker.org. Turn your VPN on and off while verifying whether it pauses and resumes downloading.

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[–] CrabAndBroom@lemmy.ml 3 points 2 years ago

Mullvad has one right in the GUI too, it's called "Lockdown Mode" IIRC.

Also qBittorrent has a thing in preferences where you can bind it to a specific network interface, so you can just set it to whatever your VPN uses (for Mullvad Wireguard it's 'wg-mullvad') and then if the VPN goes down it just won't do anything.