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Re: v6 subnet size for DSL & leased line customers
On Thu, 27 Dec 2007 12:11:54 +0100 Iljitsch van Beijnum <[email protected]> wrote: > > On 27 dec 2007, at 11:57, [email protected] wrote: > > > "Configure this stuff manually" may work for a small number of > > customers. It is highly undesirable (and probably won't be considered > > at all) in an environment with, say, 1 million customers. > > Of course not. But RAs on a subnet with a million customers doesn't > work either, nor does DHCP on a subnet with a million customers. > > If we're talking about provisioning cable/DSL/FTTH users, that's a > completely different thing. Here, DHCPv6 prefix delegation to a CPE > which then provides configuration to hosts on its LAN side would be > the most appropriate option. However, the specifics of that model need > to be worked out as there are currently no ISPs and no CPEs that do > that, as far as I know. I haven't had a chance to test it, but according to "Deploying IPv6 Networks", IOS can support DHCPv6 based prefix delegation. It even supports multiple downstream interfaces on the CPE - you configure the subnet number you want on each of the interfaces, and the CPE will configure the DHCP-PD learned /48 on the front of them automatically and then start announcing those prefixes in RAs out those interfaces. Regards, Mark. -- "Sheep are slow and tasty, and therefore must remain constantly alert." - Bruce Schneier, "Beyond Fear"