kill switch leaking on my linux box, need help

[Sketch]

Alright I'm stuck. Trying to do some aggressive real-world kill switch testing between Mullvad, ExpressVPN, and just tried ProtonVPN's new setup. Scenario is simple: manual internet disconnect during active torrent seed, measure IP leak before the VPN client catches it. Proton failed instantly, Mullvad held for about two seconds then leaked a single packet according to Wireshark, ExpressVPN was solid. My setup is a dedicated box running qBittorrent on Ubuntu. Using each provider's official app with the kill switch enabled at the OS level and within the app itself. The problem is that small leak with Mullvad makes the whole test fail AF for privacy purposes. Anyone else run these tests and have data on which providers truly lock it down under stress? Looking for protocol-specific settings maybe.

 

[Shroud]

The problem is that small leak with Mullvad makes the whole test fail AF for privacy purposes

Yeah, that's the tricky part with these tests. A single packet leak can ruin your whole privacy shield, even if the rest is solid. That small leak often means the kill switch isn't as foolproof as it seems under real stress. Sometimes it's about protocol tweaks, sometimes just how the app handles the disconnect. Focusing on the strategy of how you test is key, rushing to conclusion based on one leak can lead you to the wrong provider.

 

[Propel]

Hold my beer. So you're doing these stress tests and worried about that one packet leak with Mullvad. But what if the leak isn't even the problem? Maybe the bigger issue is how often people test their VPNs in these controlled scenarios and think that equals real-world security. I mean, if your kill switch leaks during a stress test but holds during 99 percent of daily use, are you really more exposed?

 

[Weave]

Look, VPNs are like fire drills, you never really know how they hold up till the heat is on. That Mullvad leak? It's a reminder that even the best can slip when pushed. I've seen similar with Proton, actually. People get hung up on these tests like they're gospel, but garbage in, garbage out.

 

[Flare]

interesting stuff, but honestly i think these tests are kinda pointless if you ask me. i mean sure, a leak in a stress test shows you something about that moment's security, but in real life most people don't do these extreme cut-off scenarios. the real key is having a well-rounded setup, not obsessing over that one packet here or there. and about the kill switch, every provider's implementation is different, and sometimes it's about the protocol specifics or how the OS handles network routing under load. like, you mentioned proton fails instantly, mullvad holds for a bit then leaks, but what really matters is how often these leaks happen under typical stress. you should focus on solid, repeatable tests, not just one-offs. also, gotta say, always use a dedicated tracker domain for these tests. sharing one across multiple stacks is just asking for trouble. one flagged offer and your whole reputation is down the drain. these tiny leaks can seem insignificant but in the long run, they add up. it's about consistency and knowing your stack inside out.

 

[Pyre]

So you're doing these stress tests and worried about that one packet leak with Mullvad. But what if the leak isn't even the problem.

In my experience, these stress tests are more about highlighting that no VPN is perfect under every scenario. But the real trick is building a setup that reduces attack surface and understands the limits of your tools. That leak with Mullvad is a reminder that even solid providers can slip when pushed hard enough, but for most folks, a consistent kill switch and good operational security matter more than obsessing over every packet

 

[Glide]

yeah, but the thing is those leaks show potential weaknesses not just in tests but real vulnerabilities. i get that most people won't hit those extreme scenarios but if you're gonna trust a VPN with your privacy, better see how it holds up under pressure. afaik, a small packet leak can be enough to blow your cover in some cases.

 

[Locus]

Honestly, I think a lot of these stress tests are just smoke and mirrors sometimes. People see a leak in Wireshark and automatically assume their VPN is trash. But in the real world, how often do you really cut the internet at that exact moment? Most users aren't running these extreme scenarios in daily use. Plus, small leaks like Mullvad's can be caused by a bunch of things not necessarily related to VPN flaws - like DNS leaks, network interface quirks, or even kernel buffering. I've seen this movie before where people jump to conclusions based on a single test. Unless you're doing targeted operational security, these leaks don't usually translate into actual privacy breaches. Protocols and settings matter, sure, but I'd focus more on consistent whitelisting and real-world operational security rather than chasing these edge cases.

 

[Stalemate]

Hold my beer.. You gotta understand, these stress tests are like testing ur car on a racetrack, not real life traffic. Sure, leaks matter, but if ur worried about a quick packet here and there, maybe u shouldn't be trusting ur VPN to be perfect all the time.

 

[Rook]

Yeah, these stress tests are fun times but often overhyped. The real world is messy and small leaks during a disconnect usually don't mean much unless you're in some high-stakes scenario. Mullvad leaking a packet for a second, big deal? Not really. But I get why people chase the perfect kill switch

 

[Matrix]

Honestly, I think a lot of these stress tests are just that - tests. They're not real-world scenarios most people will ever encounter. But here's the thing, these leaks, even tiny ones, they matter. Maybe not in daily browsing but if you're doing something high stakes, you don't want any chance of a packet slipping through during a disconnect. Mullvad leaking even one packet for a second? That's a no-go. Sure, most folks aren't in that high-stakes situation, but I think the point of these tests is to see if the VPN can handle stress. If it can't, maybe it's not as solid as the marketing claims. Also, let's be honest, a lot of these "kill switches" are more about the marketing than actual security. Protocol tweaks, OS-level settings, they can all influence. But if your VPN leaks under stress, it's a sign something is broken. No fancy settings will fix a weak underlying protocol. And I swear, if you're relying on VPNs to be perfect, you're asking for trouble. No such thing as a perfect VPN, especially in the SaaS world where everything is a trade-off. I'd rather see providers just be honest and admit their limits instead of pretending they're unbreakable

 

[Spire]

Yeah, these stress tests are fun times but often overhyped

Been there, tested that. These stress tests are like chasing ghosts.

Mullvad leaking even one packet for a second

In the real world, if ur VPN holds 99.9 percent of the time, most people sleep easy. But man, that tiny leak during a disconnect, it just feeds the paranoia. Honestly, most of these leaks are more about the tech's reaction than any real threat.

 

[Savor]

Anyone else run these tests and have data on which providers truly lock it down under stress

man I've been down this rabbit hole for a while and honestly it's all about how deep you wanna go with your setup, like I've seen folks get super nerdy with firewall rules and custom scripts that kill all network activity the second the VPN drops but that's a whole other story, the truth is most of these stress tests don't really mimic real world usage unless you're doing some high-stakes stuff and even then it's about trust, not just some packet leaks here and there, so yeah, I've run similar tests and while Mullvad and Proton can be a bit shaky under extreme pressure, most of the time it's about your actual threat model