On Thu, Jun 09, 2011 at 01:32:58AM -0700, Owen DeLong wrote: > > IPv6 netmasks work exactly like IPv4 netmasks. You can even route > > /128's if you want. Two major caveats: > > > > 1. SLAAC (stateless autoconfiguration, the more or less replacement > > for DHCP) only works if the subnet on your LAN is exactly /64. So > > unless you're manually configuring the IPv6 address on every machine > > on your subnet, you're using a /64. > > > You can actually use DHCPv6 to assign addresses to hosts dynamically > on longer than /64 networks. > > However, you may have to go to some effort to add DHCPv6 support to > those hosts first.
Also, there is no prefix-length (or default router) option in DHCPv6, so you have to configure the Router Advertisements with the longer prefix length in this case.