On Fri, 23 Jul 2010 00:33:45 +0100 Matthew Walster <matthew@walster.org> wrote:
On 22 July 2010 14:11, Alex Band <alexb@ripe.net> wrote:
There are more options, but these two are the most convenient weighing all the up and downsides. Does anyone disagree?
I never saw the point of assigning a /48 to a DSL customer. Surely the better idea would be to assign your bog standard residential DSL customer a /64 and assign them a /56 or /48 if they request it, routed to an IP of their choosing.
I estimate that an addressing request will cost the ISP at least 15 minutes of time to process. When a minimum allocation of a /32 contains 16 777 216 /56s, do you really need to create that artificial addressing cost, eventually passed onto the customer? With more address space than we need, the value we get is addressing convenience (just like we've had in Ethernet addressing since 1982). There is no need to make IPv6 addressing artificially precious and as costly as IPv4 addressing is. There are a variety of scenarios where customers, including residential, will benefit from having multiple subnets. They may wish to separate the wired and wireless segments, to prevent multicast IPTV from degrading wireless performance. They may wish to segregate the children/family PC from the adult PC network or SOHO network, allowing the subnet boundary to be an additional Internet access policy enforcement point. They'll need separate subnets if they wish to use a different link layer technology, such as LoWPAN. They may wish to setup a separate subnet to act as a DMZ for Internet facing devices, such as a local web server for sharing photos with relatives. Game consoles may be put in a separate subnet to ensure file transfers don't interfere with game traffic latency, using the subnet ID as a QoS classifier.
For the rest of it, I largely agree, though.
M