Your post is incomplete. Instead of saying "announce IPv6", it might be better to say "announce IPv6 with SLAAC" or "announce SLAAC-supporting IPv6". If, in t

Your post is incomplete. Instead of saying "announce IPv6", it might be better to say "announce IPv6 with SLAAC" or "announce SLAAC-supporting IPv6". If, in the Route Announcements, you enable the M flag, then that disables SLAAC on your subnet, forcing folks to use DHCPv6 for an IP allocation (or use a static IPv6 address). Besides, that "fun exercise" is what ISPs often do: For example, Comcast turned on IPv6 without any warning (at least, no warning pushed to customers). In my case, I (the user) didn't notice it was in use until I checked, which I think is exactly how it is supposed to work for the end-user.