Server IPv6 support

[astro]

(Again based on the open PR #47 because it is a fundamental change. Sorry.)

Possible improvement: We may want to indicate to the Swarm backend whether IPv6 peers are desired at all. They are not supported in UDP responses.

[feross]

Is there a BEP for udp IPv6 support?

[astro]

Not that I know of. :-( There's this in BEP-15:

IPv6 is not supported at the moment. A simple way to support IPv6 would be to increase the size of all IP addresses to 128 bits when the request is done over IPv6. However, I think more experience with IPv6 and discussion is needed before including it.

The solution is expressed very vaguely. I cannot imagine that anyone would have implemented that already.

[feross]

Yeah, I saw the same thing. :(

On Sat Dec 13 2014 at 3:19:53 PM Astro notifications@github.com wrote:

Not that I know of. :-( There's this in BEP-15
http://www.bittorrent.org/beps/bep_0015.html#ipv6:

IPv6 is not supported at the moment. A simple way to support IPv6 would be
to increase the size of all IP addresses to 128 bits when the request is
done over IPv6. However, I think more experience with IPv6 and discussion
is needed before including it.

The solution is expressed very vaguely. I cannot imagine that anyone would
have implemented that already.

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