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With the risk of self-promotion, I did write a blog about the issues and mitigations: https://herczegzsolt.hu/posts/soho-ipv6-in-2025-still-dicey/

But I have to admit, that I ended up buying my own IPv6 block from a local ISP and tunnel to them. They have great interconnections, so bandwidth is not an issue, and latency penalty is less then 2 ms an average.

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Thanks. A quick glance of that looks very promising. Lots of detail on the problem.

I’ll have a proper read of that tomorrow morning :)

TLDR: Turn the frequency of your RA-s waay up (3-5s) and their valid lifecycle way down (10-30s). There's still gonna be a hickup, but it should be tolerable.

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