9 Jun
2011
9 Jun
'11
8:09 a.m.
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.