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Filtering is a very important issue in next generation networks. These networks consist of a relatively high number of resource constrained devices with very special features, such as managing frequent topology changes. At each topology change, the access control policy of all nodes of the network must be automatically modified. In order to manage these access control requirements, Firewalls have been proposed by several researchers. However, many of the problems of traditional firewalls are aggravated due to these networks particularities. This paper deeply analyzes the local consistency problem in firewall rule sets, with special focus on automatic frequent rule set updates, which is the case of the dynamic nature of next generation networks.
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