Me vino a la mente alguien que pregunto por algo asi en la lista....
A Technique for Counting NATted Hosts
Steven M. Bellovin
[EMAIL PROTECTED]
AT&T Labs Research
Abstract- There have been many attempts to measure
how many hosts are on the Internet. Many of those endpoints,
however, are NAT boxes (Network Address Translators),
and actually represent several different computers.
We describe a technique for detecting NATs and counting
the number of active hosts behind them. The technique is
based on the observation that on many operating systems,
the IP header's ID field is a simple counter. By suitable
processing of trace data, packets emanating from individual
machines can be isolated, and the number of machines
determined. Our implementation, tested on aggregated local
trace data, demonstrates the feasibility (and limitations)
of the scheme.
