Cogent IPv6

Chuck Anderson cra at WPI.EDU
Thu Jun 9 12:09:23 UTC 2011

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.

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