Nothing weird there. fe80::/64 is routed to _all_ interfaces and as such which interface should ping use? As for PuTTY, even with the IPv6 patches... it doesn't support scoping, which would normally be done using fe80::1%cable or fe80::1%10 or similar. You should request and then use a subnet, not the linklocal (fe80::/64) addresses. But as you mention that your fedora gateway 'runs a radvd' I guess you mean that it is supplying a route already on your network, thus use that. Link-local addresses are not routable mind you. Small trick though: netsh int ipv6 add route fe80::201:2ff:fef9:c3ff "Cable" This will specifically route that IP over your "Cable" interface or however you have called it (see 'int ipv6 show interface'). This could work. And yes that is a _very_ convenient method when one has peeped up IPv4 _and_ IPv6, as long as the IPv6 stack is running and you are on a directly connected host you can still access the nexthop. And when you forgot what IP it had: ping6 ff02::2%cable for your router or ff02::1 for all the other hosts.