Steam doesn't work with IPv6

[Marzanna]

Hello. I tried to use Steam on IPv6 only network (with NAT64). But It looks like Steam has no connection when I launch it. There is no problem with dual stack network. Does Steam support IPv6? It's 2024 and all major tech companies should support IPv6 for their services.

[Spectre]

I'm also planning to withdraw IPv4 (going v6-only with NAT64) because the necessary hazzle for Dual-Stack is pretty ugly.

So I'm also interested in the answer.

[Dan5000]

No it doesn't support it, Steam needs a IPv4 connection to work.

[Spectre]

Do we know which IPs are used by Steam? I maybe have an Idea howto workaround that limitation.

[rawWwRrr]

https://help.steampowered.com/en/faqs/view/2EA8-4D75-DA21-31EB

[Marzanna]

So Valve has 6,476700408×10²⁴ IPv6 addresses but Steam still doesn't use IPv6?

[Iceira]

Thats not how it work, if you own ISP use it then you need it, if they dont then its ipv4 only for you.

ps.
any issue with it talk with own ISP and they will tell you.

[Marzanna]

I have /64 ipv6 subnet on home internet connection, And /48 on my VPS. And that's A LOT! I cant' even imagine what to do with this amount of IP addresses. Valve has 31 of /48 subnets. I'm pretty sure they can run their services on every planet in our universe using ipv6

[Ettanin]

Steam needs IPv4 to work properly. The minimum you can use is Dual Stack Lite or CGNAT.

Unless laws are set in motion that ban the use of IPv4, Valve won't change anything.

[rawWwRrr]

Originally posted by Marzanna:

I have /64 ipv6 subnet on home internet connection, And /48 on my VPS. And that's A LOT! I cant' even imagine what to do with this amount of IP addresses. Valve has 31 of /48 subnets. I'm pretty sure they can run their services on every planet in our universe using ipv6

They can, yes. But they don't operate the entire internet. There is a lot between them and their end users. And if you've been keeping up on IPv6 deployment, it's still an uneven distribution of adoption around 50% globally. There are even some backbone nodes that are still operating on IPv4. For a service that needs to be available for everyone worldwide, they go with what works worldwide and that's still IPv4.

[Crashed]

Originally posted by Marzanna:

Hello. I tried to use Steam on IPv6 only network (with NAT64). But It looks like Steam has no connection when I launch it. There is no problem with dual stack network. Does Steam support IPv6? It's 2024 and all major tech companies should support IPv6 for their services.

There will still be legacy games that cannot use IPv6. Software has to support IPv6 for it to be usable.

Steam's IPv4 network to the best of my knowledge supports play even on CGNAT networks where you have no ability to forward ports.