Hello Jan, thank you for your reply!
Why would any firewall go so far as to specifically filter on DNS queries with certain flags?! I didn't even know that was possible :/. Could this be done by my ISP? If so, is there a way I can find out where exactly this filtering happens? I am using a Linksys Router that still has the firmware of VPNExpress on it, even though I no longer have an account there. I suppose that theoretically it is possible that even my own router does this, because DNS (leakage) is a VPN thing - if that is the case then I want to switch back to opensource firmware... In that case the closing of the connection should be sub-millisecond I think. I wonder if I can measure that easily? Carlo On Fri, 17 Oct 2025 21:22:24 +0000 "Jan Komissar (jkomissa)" <[email protected]> wrote: > Your result may be caused by a misconfigured firewall that > drops outgoing DNS queries without the recursion flag set.
