Gaming Consoles and IPv4
Justin Wilson (Lists)
lists at mtin.net
Mon Sep 28 12:22:28 UTC 2020
There are many things going on with gaming that makes natted IPv4 an issue when it comes to consoles and gaming in general. When you break it down it makes sense.
-You have voice chat
-You are receiving data from servers about other people in the game
-You are sending data to servers about yourself
-If you are using certain features where you are “the host” then you are serving content from your gaming console. This is not much different than a customer running a web server. You can’t have more than one customer running a port 80 web-server behind nat.
-Streaming to services like Twitch or YouTube
All of these take up standard, agreed upon ports. It’s really only prevalent on gaming consoles because they are doing many functions. Look at it another way. You have a customer doing the following.
-Making a VOIP call
-Streaming a movie
-Running a web server
-Running bittorrent on a single port
-Having a camera folks need to access from the outside world
This is why platforms like Xbox developed things like Teredo.
j2sw at mtin.net
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> On Sep 27, 2020, at 9:33 PM, Daniel Sterling <sterling.daniel at gmail.com> wrote:
> Matt Hoppes raises an interesting question,
> At the risk of this being off-topic, in the latest call of duty games I've played, their UDP-NAT-breaking algorithm seems to work rather well and should function fine even behind CGNAT. Ironically turning on upnp makes this *worse*, because when their algorithm probes to see what ports to use, upnp sends all traffic from the "magical xbox port" to one box instead of letting NAT control the ports. This does cause problems when multiple xboxes are behind one NAT doing upnp. If upnp is on and both xboxes are fully powered off and then turned on one at a time, things do work. But when upnp is off everything works w/o having to do that.
> There are many other games and many CPE NAT boxes that may do horrible things, but CGNAT by itself shouldn't cause problems for any recent device / gaming system.
> It is true that I've yet to see any FPS game use ipv6. I assume that's cuz they can't count on users having v6, so they have to support v4, and it wouldn't be worth their while to have their gaming host support dual-stack. just a guess there
> -- Dan
> On Sun, Sep 27, 2020 at 7:29 PM Mike Hammett <nanog at ics-il.net <mailto:nanog at ics-il.net>> wrote:
> Actually, uPNP is the only way to get two devices to work behind one public IP, at least with XBox 360s. I haven't kept up in that realm.
> Mike Hammett
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> From: "Matt Hoppes" <mattlists at rivervalleyinternet.net <mailto:mattlists at rivervalleyinternet.net>>
> To: "Darin Steffl" <darin.steffl at mnwifi.com <mailto:darin.steffl at mnwifi.com>>
> Cc: "North American Network Operators' Group" <nanog at nanog.org <mailto:nanog at nanog.org>>
> Sent: Sunday, September 27, 2020 1:22:51 PM
> Subject: Re: Gaming Consoles and IPv4
> I understand that. But there’s a host of reasons why that night not work - two devices trying to use UPNP behind the same PAT device, an apartment complex or hotel WiFi system, etc.
> On Sep 27, 2020, at 2:17 PM, Darin Steffl <darin.steffl at mnwifi.com <mailto:darin.steffl at mnwifi.com>> wrote:
> This isn't rocket science.
> Give each customer their own ipv4 IP address and turn on upnp, then they will have open NAT to play their game and host.
> On Sun, Sep 27, 2020, 12:50 PM Matt Hoppes <mattlists at rivervalleyinternet.net <mailto:mattlists at rivervalleyinternet.net>> wrote:
> I know the solution is always “IPv6”, but I’m curious if anyone here knows why gaming consoles are so stupid when it comes to IPv4?
> We have VoIP and video systems that work fine through multiple layers of PAT and NAT. Why do we still have gaming consoles, in 2020, that can’t find their way through a PAT system with STUN or other methods?
> It seems like this should be a simple solution, why are we still opening ports or having systems that don’t work?
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