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A comment on IPv6 Traffic Crosses the 50% Mark for the First Time. Parent comment

Re:IPv6 Traffic Crosses the 50% Mark for the First Time by Dagger2 on Thursday April 16, 2026 @06:54AM (#47791264)
The prod servers work. The app does a DNS lookup, receives something like 64:ff9b::140.82.112.5 and 140.82.112.5 from the ISP's DNS servers, and then connects to 64:ff9b::140.82.112.5. Some part of the ISP network translates the connection into a v4 connection to 140.82.112.5.

The requirement is simply that the app does AAAA queries, and that it attempts to connect to them if they exist. It doesn't matter whether the server does v6 natively or if the ISP is covering for a v4-only server via backwards compatibility. (Native v6 will probably perform better, but any site that wants to give up that advantage is free to do so.)

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Re:IPv6 Traffic Crosses the 50% Mark for the First Time by lxgr on Thursday April 16, 2026 @10:47AM (#47793848)
That’s DNS64, which is pretty annoying in practice. (For one thing, you can’t use your own DNS server anymore, but more importantly, anything using v4 literals will 100% break.)

What’s nicer is 464XLAT, or more generally NAT64 prefix announcements. Then your local OS can just synthesize NAT64 addresses from v4 literals, either at the socket library or kernel networking (via “bump in the stack” translation) layer.

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