Testing multicast on an IPv6-only network...
root@r0:/usr/src# git clone https://github.com/brettsheffield/castinet.git Cloning into 'castinet'... fatal: unable to access 'https://github.com/brettsheffield/castinet.git/': Couldn't connect to server root@r0:/usr/src# host github.com github.com has address 220.127.116.11 github.com has address 18.104.22.168 github.com mail is handled by 5 ALT1.ASPMX.L.GOOGLE.COM. github.com mail is handled by 10 ALT4.ASPMX.L.GOOGLE.COM. github.com mail is handled by 5 ALT2.ASPMX.L.GOOGLE.COM. github.com mail is handled by 10 ALT3.ASPMX.L.GOOGLE.COM. github.com mail is handled by 1 ASPMX.L.GOOGLE.COM.
Ah, of course, I forgot. Github has no IPv6 support. Come on, even Amazon is finally getting themselves organised.
2018-08-23 Another year passes... still no IPv6 at github *sigh*.