IPv6 Auto Discovery

[Doug Hardie]

Mac OS-X does a form of auto discovery on IPv6 where the machines on a  
local network add the machine name to the ndp table when they see  
activity from that machine.  So far I only have a rudimentary IPv6  
configuration on FreeBSD 7 running and it only sees the IP address,  
and then only after I ping the other end.  I couldn't find anything  
in /etc/defaults that seems to address auto discovery.  Is this  
something I have missed or what?  Thanks.