On 02/01/2015 01:33, 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)
The BCP is http://tools.ietf.org/html/rfc6177
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.
RFC6177 suggests flexibility. /48s are not rare commodities - we have trillions
of them, quite literally. So I've never seen any risk in handing them out to
small customers, but unless you are fortunate enough to have a small customer
grow into a very big customer, I guess there's no risk in /56s either.
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texts are a few years old now and some providers have told me that this advice is no
longer current but I haven’t yet seen this codified.
For that see http://tools.ietf.org/html/rfc6164
. As far as I know /127
has become the majority solution.
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
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at length to be out of date / disputed so I am primarily looking for what the current best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)
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