@sun @RustyCrab @0 @pwm @thegreatape

just being pedantic here in case someone reading along is unfamiliar with all of this --

Theoretically 1460 as you forgot the 20 bytes overhead of IP itself, but due to different last mile internet technologies (e.g., DSL, things that add their own encapsulation) -- if you want to do it in one packet without having it fragmented you would want to aim for 1420. You'd do 1380 if you want to be ultra paranoid. Lots of VPNs will clamp at 1380 for that reason.