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[Sticky] I found the apparent cause of the bad:cast error 2 months later.

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(@dandelionsprout)
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Since the original thread got closed, I just figured it was worth for me to share that I found the cause some 2 months later in order to have it written on the record, and it turned out it was on my end. 😓

I've been running a DNS server on my PC (with the AdGuard Home backend), and it turned out that in its YAML settings there was a setting called "use dns64" (Presumably intended by that backend's devs as a nickname for NAT64) to true broke a lot of the internet except in web browsers. Setting it to false seems to have made SDI Origin work correctly on IPv6 again.


   
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Glenn
(@glenn)
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A dns server. Is it also a vpn?  That explains why I was never able to reproduce it, why it's a problem only for a few people. If not AdGuard then something similar.


   
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(@dandelionsprout)
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It's not a VPN on my end, at least. It's a relatively simple but customisable DNS server; reminiscent of Pi-hole but much better (Many more settings and much better syntax support for adblock entries).


   
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Glenn
(@glenn)
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and it's blocking ipv6 torrents? or is that a byproduct of a broken ipv6 dns server?


   
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(@dandelionsprout)
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Essentially there was a bug where a setting that claimed to enable NAT64, instead made the 64:ff9b resolvements of NAT64 results the end destination, instead of discarding those resolvements or processing them any further, affecting at least 2 of the 4 torrent addresses, and likely other important addresses too.

https://github.com/AdguardTeam/AdGuardHome/issues/7898 contains most of the details, and the eventual fix method for it.

This post was modified 2 weeks ago by DandelionSprout

   
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