This can particularly play havoc with sensitive protocols like STUN. I believe many game consoles make use of this when in multiplayer matches. I have personally run into this using OpenBSD's pf, but I'm fortunate enough to have access and the known-how to fix it for my consoles.
It's one of those things that's fine until you run into "edge cases," and unfortunately NAT configurations can introduce a lot of undefined behavior from the user perspective.
https://serverfault.com/questions/208522/what-is-strict-mode...
This can particularly play havoc with sensitive protocols like STUN. I believe many game consoles make use of this when in multiplayer matches. I have personally run into this using OpenBSD's pf, but I'm fortunate enough to have access and the known-how to fix it for my consoles.
It's one of those things that's fine until you run into "edge cases," and unfortunately NAT configurations can introduce a lot of undefined behavior from the user perspective.