[141574] in North American Network Operators' Group
Re: Cogent IPv6
daemon@ATHENA.MIT.EDU (Chuck Anderson)
Thu Jun 9 08:10:08 2011
Date: Thu, 9 Jun 2011 08:09:23 -0400
From: Chuck Anderson <cra@WPI.EDU>
To: nanog@nanog.org
Mail-Followup-To: nanog@nanog.org
In-Reply-To: <FF08A2D0-4DE7-4F18-B08A-A3F5179DCE5B@delong.com>
Errors-To: nanog-bounces+nanog.discuss=bloom-picayune.mit.edu@nanog.org
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.
