On 5 aug 2008, at 3:41, Brian E Carpenter wrote:
In case people aren't already aware of it, I think the work at the
second URL below is very interesting in discussing the possible
implications of CGN, and in particular the number of outbound and
inbound ports needed per active host.
Hm, it looks like the high water marks for TCP and UDP sessions per
subscriber (including non-active subscribers) is around 20 and 40.
For our purposes we can probably assume that the UDP is lower than TCP
because UDP in this is very likely mostly DNS which shouldn't have to
go through a NAT64.
So that means a single IPv4 address can support about 3000 subscribers.
However, in the future it's likely that each subscriber will have a
larger number of devices so we shouldn't be too surprised if this goes
down.
I'd say based on this, our order of magnitude number would have to be
1000 subscribers per IPv4 address = a /22 per million users.
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