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IPv6 Day came & passed, but the myth services were apparently unaffected, however in the not so distant future will myth glitch-out if it only has access to an IPv6 network?

There is no explicit IPv6 support in Myth.

Is this something that is easy or hard to implement, or is myth relying on OS functions for networking so there is an effective layer of abstraction in place obviating any "need to know" about the network structure?

Yeah IPv6 day was only relevant to a number of the big providers like Google, etc. who enabled an IPv6 version of their sites. Myth obviously was unaffected.

I haven't looked into it in detail but Myth shouldn't require a huge amount of changes to work with IPv6 , although it's not trivial. The metaserver experience should technically work in a similar way, while obviously the TCP/IP stuff would need to change a bit (name resolution obviously becomes more important with 128-bit addresses).

Once my ISP supports IPv6 I'll consider starting to mess around with it; that said, the Myth networking code is layers of pain last time I looked into it