I'd like to be able to use Back to My Mac over the IPv6 internet. I've already got IPv6 access (i.e. My Airport is assigned a /64 block from my ISP and sends out RAs so everyone on the network can autoconfigure their own public IPv6 addresses. My computer assigns itself both an address based on its MAC address, and a temporary address. I can visit ipv6.google.com and everything.) but for some reason a useless loopback IPv6 address is getting registered with Back to My Mac instead of a useful address.
Here what I get using dns-sd:
Timestamp Recommended Browsing domain 0:15:52.133 Added (More) local 0:15:52.134 Added icloud.com - > btmm - - > members - - - > 12345678
dns-sd -B _services._dns-sd._udp 12345678.members.btmm.icloud.com
Browsing for _services._dns-sd._udp.12345678.members.btmm.icloud.com Timestamp A/R Flags if Domain Service Type Instance Name 0:23:19.685 Add 3 0 . _tcp.local. _rfb 0:23:19.686 Add 3 0 . _tcp.local. _ssh 0:23:19.686 Add 3 0 . _tcp.local. _sftp-ssh 0:23:19.686 Add 2 0 . _tcp.local. _airvideoserver
dns-sd -B _rfb 12345678.members.btmm.icloud.com
Browsing for _rfb._tcp.12345678.members.btmm.icloud.com Timestamp A/R Flags if Domain Service Type Instance Name 0:25:02.255 Add 2 0 12345678.members.btmm.icloud.com. _rfb._tcp. Mac
dns-sd -L Mac _rfb 12345678.members.btmm.icloud.com
Lookup Mac._rfb._tcp.12345678.members.btmm.icloud.com 0:26:33.431 Mac._rfb._tcp.12345678.members.btmm.icloud.com. can be reached at Mac.12345678.members.btmm.icloud.com.:5900 (interface 0)
dns-sd -G v6 Mac.12345678.members.btmm.icloud.com.
Timestamp A/R Flags if Hostname Address TTL 0:27:45.201 Add 2 0 Mac.12345678.members.btmm.icloud.com. FDDC:DBC8:58A7:8322:021F:5BFF:FE3E:3C44%<0> 152
The IPv6 address registered is for ln0, the loopback interface that is useless to anything but the computer running the services. ifconfig lists my IPv6 addresses, including an autoconfigured, temporary, public IPv6 address on my system's real network interface, which would be perfect. Why does dns-sd not register services using this address, and how can I make it do so?
An additional note, my router supports NAT-PMP so even though my computer doesn't directly have a public IPv4 address I'd expect it to use NAT-PMP to make sure services I've enabled are available over IPv4, but this doesn't seem to be the case. When I look up a service instance in the
12345678.members.btmm.icloud.com domain and then use dns-sd -G v4 to resolve the given hostname it says there's no IPv4 record.