On Fri, Jan 02, 2015 at 01:33:08AM +1300, Alexander Neilson wrote:
I wondered if anyone on here had any guidance on any current BCP (or BCOP) or some general guidance on IPv6 allocations to customers (I am speaking here only for casual day to day allocations to customers)
Looking through email archives and discussions that have seen around there was fairly vigorous discussions but no real resolutions. I have seen suggestions of /48, /50, /56. I am inclined to allocate /56???s to each customer (providing 256 /64???s). I don???t want to prevent customers from having the flexibility to do what they need / want to do nor stymie future use cases.
If there is some good guidance on a need for /48???s then I will look at it and will use those if needed.
Also, is current operating practice amongst others for all links to be /64???s even for p2p links? It seems a lot of documentation / reference texts are a few years old now and some providers have told me that this advice is no longer current but I haven???t yet seen this codified.
My /32 allocation is provisionally as follows: 16 bits of /56 allocations - 65,535 customer allocations 8 bits for internal (leaves me 255 /64???s for p2p links between routers)
Currently using PPPoE for IPv4 authentication for bulk customers and bespoke routed configurations for the rest. I intend to continue the PPPoE at this stage and just provide dual stack to every customer when connecting.
I am still open to any input people have or feedback about what contributed to their deployments.
I have looked into archives but was unable to find clear guidance that wasn???t discussed at length to be out of date / disputed so I am primarily looking for what the current best practice is so I can take advantage of the best advise for rolling out the deployment (I know we are late to this party but better late than never)
There are some posts on nanog about this. New Zealand doesn't really have much IPv6 usage. The general recommendation seems to be to give out /48s to users. Although you may only have a /32 at the moment, you can apply for more space in the future if you require it. It is generally given that /48 is the smallest allocation that one can advertise over the internet. And if a customer wants to multihome in multiple locations then each location should have a /48 at the least. I'm not really sure how much harm there is in giving out /56s to home and small business users who are unlikely to want to multihome but at the least it shortens allocations when giving out more space. There's a bit more information at http://bcop.nanog.org/index.php/IPv6_Subnetting There is an arguement of going to something in between /64 and /127. But allocating a /64 and using a /126 on it isn't a bad thing, giving odd upstream, even downstream, although some people like the idea of making it /124 or such, to allow for things like VRRP etc you can always extend later. There is a concern if people don't liberally give out IP addresses users will try and conserve IP addresses and do things like share IP adddresses within a subnet instead of routing them. And one of the visions of IPv6 sems to be to get away from NAT, and the conservation of IP addresses. Ben.