[arin-discuss] Trying to Understand IPV6

[Lee Howard]

> It is very typical. /48 to every customer, no exceptions. If a customer
> wants less, assign them a /48 anyway and only tell them the first part
> of the prefix. When they get wiser, tell them the /48 that you 
> "reserved" for them. 

Depends on what kind of customers you have.
If the bulk of your customers are residential, and you expect to assign
them prefixes dynamically, then it is very likely you will only assign
them a prefix of whatever length is hinted in their DHCPv6 request.
You still have the policy decision of "what is the largest prefix request
I will honor?" but that's a different question.

If many of your customers are dial-up, you may decide that multiple
subnets are unlikely, and default to a /64.

For customers with statically-assigned prefixes, do whatever you want.
Nibble-boundary prefixes are recommended (so you can delegate
reverse DNS), and multiple /64s are encouraged.  So, between /48 and
/60, but you might make it easier on yourself to pick a prefix length and
use the same for everyone.

> Don't gamble on this. ARIN expects you to assign a /48 to everyone, and
> if you use less then you are only punishing yourself by increasing the
> complexity of your network and your management processes.

s/expects/allows
https://www.arin.net/policy/nrpm.html#six54

The following guidelines may be useful (but they are only guidelines):
	* /64 when it is known that one and only one subnet is needed
	* /56 for small sites, those expected to need only a few subnets over the next 
5 years.
	* /48 for larger sitesand
Subsequent IPv6 allocations, based on HD-Ratio in units of /56 assignments.

Lee


      
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