With NAT what is the recommended nb of users per public IP@ ?

Unanswered Question
Jan 14th, 2009

Supposing that I need to design an ISP network to serve N subscribers, is it a way to compute the mimimum number of public IP addresses that I need to provision ?

For this I suppose it would be needed to know:

- the max number of sockets that are open by a user

- the average nb of sockets open per user

and use aggressive/standard/conservative approach then to compute the needed nb of IP addresses:

a) Aggressive:

Nb IP = Nb users / [65536 / Nb average of sockets per user]

b) Standard:

Nb IP = Nb users / [65536 / (Nb average of sockets per user * 1.x)]

c) Conservative:

Nb IP = Nb users / [65536 / Nb max of sockets per user]

I have 2 questions:

1) is it sensible what I mentioned above?

2) does anyone have figures from a real network regarding the average and max nb of sockets per user or are there any studies regarding this ?

I have this problem too.
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