On Jun 8, 2011, at 7:24 PM, William Herrin wrote: > On Wed, Jun 8, 2011 at 9:58 PM, Kelly Setzer <kelly.set...@wnco.com> wrote: >> IPv6 newbie alert! >> >> I thought the maximum prefix length for IPv6 was 64 bits, >> so the comment about a v6 /112 for peering vexed me. I >> have Googled so much that Larry Page called me and >> asked me to stop. >> >> Can someone please point me to a resource that explains >> how IPv6 subnets larger than 64 bits function and how >> they would typically be used? > > Hi Kelly, > > 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. Owen
