I always check for a basic level of connectivity by pinging the all-hosts multicast address, e.g.,
ping6 ff02::1%wm0 You can also try pinging the second host's link-local address, ping6 fe80::221:9bff:fefc:c5cc%wm0 Maybe the subnet 2605:2600:1001::/64 wasn't installed properly when the interface was configured? When I get unexpected results, I like to check for a route to the particular host: route -n get -inet6 2605:2600:1001::43 Hope that helps. Dave -- David Young dyo...@pobox.com Urbana, IL (217) 721-9981