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A comment on GitHub seems to be enabling IPv6 for GitHub Pages. Parent comment

Re:GitHub seems to be enabling IPv6 for GitHub Pages by andrewjf on Saturday August 14, 2021 @01:39PM (#28182508)
There are more and more networks that are native IPv6. And IPv4 connectivity is done with double NAT, NAT64, 464XLAT and other heroics.

The faster we can allow native IPv6 end-to-end, the faster we can get rid of the complex IPv4 compatibility technologies and simplify the entire internet. At some point, you may start to see networks with no v4 connectivity whatsoever (maybe they already exist, but I can't imagine them being useful), so this allows those users to reach github pages.

To directly answer your question, it's investment and maintenance in infrastructure, not for user features.

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Re:GitHub seems to be enabling IPv6 for GitHub Pages by rnhmjoj on Saturday August 14, 2021 @03:00PM (#28183103)
> maybe they already exist, but I can't imagine them being useful

They are rare but do exist! Here's a couple of reports from the IPv6 subreddit: [1] [2].

[1]: https://teddit.net/r/ipv6/comments/he38ga/work_has_turned_of...

[2]: https://teddit.net/r/ipv6/comments/n5y5oo/update_on_not_bein...

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