A technique for counting natted hosts

  title={A technique for counting natted hosts},
  author={Steven M. Bellovin},
  booktitle={Internet Measurement Workshop},
There have been many attempts to measure how many hosts are on the Internet. Many of those end-points, 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… CONTINUE READING
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