[knot-dns-users] Re: TCP Fast Open deprecation

Hello Daniel, Always great when Dev's engage the community before making changes like this, thank you! No, we would not miss it. Jonty ________________________________ From: Daniel Salzman via knot-dns-users <knot-dns-users(a)lists.nic.cz> Sent: 09 December 2025 9:47 AM To: knot dns users <knot-dns-users(a)lists.nic.cz> Subject: [knot-dns-users] TCP Fast Open deprecation Hello Knot DNS users, Knot DNS supports TCP Fast Open (when configured) in both the server and client roles for several years. However, we have not observed any performance or other improvements from this technology so far. Since removing it would simplify the code, I'm considering dropping the support for it. Is there anyone who would miss TFO in Knot DNS? For better XFR efficiency between Knots, https://www.knot-dns.cz/docs/latest/singlehtml/index.html#remote-pool-limit works much better. Thanks, Daniel