[nsizx]

Still you are revealing your IP address to the other parties, which will be more than happy to DoS you to force you to disconnect, exploit 0-days in the game networking code to crash your game or get your private info, know where you are located by IP geolocation...

The idea of P2P in competitive videogames strikes me as absolutely insane

[onei]

When using NAT, you're revealing the IP address of your router. I don't know about you, but I don't have so many devices running on my home network that would drown out what I'm doing.

With NAT, you can still receive DoS attacks, still have your game networking exploited, and still be geolocated. The only remotely security-related benefit is that instead of your ports being exposed to the wild internet, they're exposed to your router which is more of a side-effect rather than an actual benefit. Its not a reason to not bother having a firewall.

[nsizx]

I didn't mention NAT at all. Practically all multiplayer games use a central server. It's impossible to know the IP addresses of your peers.

[billytetrud]

Nothing about IPv6 prevents continuing to do that when it makes sense (eg to prevent cheaters from dosing their opponents).

[ClumsyPilot]

"The idea of P2P in competitive videogames strikes me as absolutely insane"

What's insane, is the idea that you want me to use and pay for some crappy AWS server that spies on my data instead of directly connecting to my friend using my own equipment

[kaliszad]

Well, have fun guessing 2^64 possibilities. YouTube lists even private videos "secured" using 11 BASE64 characters (66 bits in theory, but they seem to use just 64 bits). You can watch Tom Scott explain it: https://www.youtube.com/watch?v=gocwRvLhDf8

CG-NAT doesn't really prevent geolocation. Better services will still pin-point you to the nearest city. There are perhaps easier ways to get your private info or your money - phishing and ransomware seem to be still very popular. Don't have to hack games that only relatively few people have. It is more profitable to attack a bigger market or more wealthy institutions or companies in foreign countries. Also, if you hack the central game server, you will have a lot more victims... Choose your poison.

I guess, there are no games or other software that cannot be audited in high security installations. At home, having a work computer and a game computer (or a VM with GPU pass through or whatever) might be a safer choice in any case independent of IPv4 or IPv6 usage or the quality of your firewall.

[kibwen]

When it comes to DoS or geolocation, attackers can just as easily work with your router's address.