IPv6 is not supported in 8.0.
I just tested IPv6 on freshly installed 8.1.1 sim under VMware Player 4.0.3 over host-only interface. Sim was minimally setup - just IPv6 enabled, no explicit address. So both sim and player were running with link local addreses. In this config I could ping sim IPv6 from host but attempt to login with PuTTY resulted in
simsim> No route to host
Thu Aug 23 22:28:20 MSK [simsim:openssh.invalid.channel.req:warning]: SSH client (SSH-2.0-PuTTY_Release_0.62) from fe80::e990:e9fa:34e9:b6c sent unsupported channel request (10, x11-req).
No route to host
No route to host
I found following in Network Guide: FreeBSD user applications like NTP, ASUP, and NDMP cannotcommunicate with destinations that have IPv6 link- local addresses.
I was not sure whether it applied to SSH as well, but after explicitly setting site local address with the same prefix I was able to correctly login into sim with PuTTY using IPv6. Of course the problem could have been simply different prefix used by DOT and Windows for link local address, but I do not know how can I set prefix for either of them.