Enable 127.3.2.1 on macos

[jagerman]

macOS by default doesn't allow binding to loopback addresses other than 127.0.0.1, but apparently you can enable them:

https://superuser.com/questions/458875/how-do-you-get-loopback-addresses-other-than-127-0-0-1-to-work-on-os-x

Since we require root already, we could alias the 127.3.2.1 address and use that on macOS (which would also avoid conflicts with other things that put DNS on 127.0.0.1).

[majestrate]

yeah but why?

[KeeJef]

If internet sharing is turned on in Mac OS, Bonjour uses 127.0.0.1:53 , Lokinet detects this ip+port as already in use and fails to do anything meaningful, has happened twice in the office on Mac devices, and i think its going to be quite a common thing.

[majestrate]

i see

[majestrate]

this would also help windows as some things also like to hold onto 127.0.0.1:53