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EURASIP Journal on Wireless Communications and Networking

, 2013:225

Advances in Trust, Security and Privacy for Wireless Networks


Firewalls are network devices dedicated to analyzing and filtering the traffic in order to separate network segments with different levels of trust. Generally, they are placed on the network perimeter and are used to separate the intranet from the Internet. Firewalls are used to forbid some protocols, to shape the bandwidth resources, and to perform deep packet inspection in order to spot malicious or unauthorized contents passing through the network. In a wireless multihop network, the concept of perimeter is hard to identify and the firewall function must be implemented on every node together with routing. But when the network size grows, the rule-set used to configure the firewall may grow accordingly and introduce latencies and instabilities for the low-power mesh nodes. We propose a novel concept of firewall in which every node filters the traffic only with a portion of the whole rule-set in order to reduce its computational burden. Even if at each hop we commit some errors, we show that the filtering efficiency measured for the whole network can achieve the desired precision, with a positive effect on the available network resources. This approach is different from the protection of a space behind a wall: we use the term waterwall to indicate a distributed and homogeneous filtering function spread among all the nodes in the network.

Electronic supplementary materialThe online version of this article doi:10.1186-1687-1499-2013-225 contains supplementary material, which is available to authorized users.

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Autor: Leonardo Maccari - Renato Lo Cigno

Fuente: https://link.springer.com/

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