External IPv6 address remains reachable
External IPv6 address remains reachable

external IPv6 address (home.nono.com) was unreachable
from outside because the local Comcast router wasn't
able to discover it because my firewall rule was
blocking neighbor-solicitation sent to multicast
address ff02::1/16.  Now external address accepts
all appropriate ICMP6 types whether sent to local
interface's address or to the multicast address

ff02::1/16 is "All nodes on the local network segment"

https://en.wikipedia.org/wiki/Multicast_address

ff02::1

cunnie/lana.nono.com-etc