Date Added: Sep 2009
Many firewall security mechanisms have evolved to mitigate the ever continuously increasing number of network attacks. Securing open and complex systems have become more and more complicated. If in addition the authors should take QoS requirements into account, the problem becomes more complicated and necessitates in-depth reflexions. Router is a key component in the internet. Its main function is to control data packet flow and determine an optimal path to reach the destination. However, as the networking technology has evolved, much new functionality have been added and implemented in the router. In the paper, besides routing function; they are also interested in other functionalities such as NAT, QoS, and stateful packet filtering.