IP agnostic real-time traffic filtering and host identification using TCP timestamps

@article{Wicherski2013IPAR,
  title={IP agnostic real-time traffic filtering and host identification using TCP timestamps},
  author={Georg Wicherski and Florian Weingarten and Ulrike Meyer},
  journal={38th Annual IEEE Conference on Local Computer Networks},
  year={2013},
  pages={647-654}
}
In this work, we describe and evaluate the design and implementation of natfilterd, a flexible and lightweight extension of the Linux netfilter packet filter framework, which enables us to identify hosts completely independent of IP addresses by taking advantage of certain characteristics of TCP timestamps. As an immediate consequence, not only can we count hosts behind a NAT gateway but block TCP traffic from single hosts without blocking the gateway itself. Our work extends ideas from… CONTINUE READING

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