Web Services Essentials
Shielding TCP from Wireless Link Errors: Retransmission Effort and Fragmentation
The Journal of Supercomputing
Vertical optimization of data transmission for mobile wireless terminals
IEEE Wireless Communications
ETFA'09 Proceedings of the 14th IEEE international conference on Emerging technologies & factory automation
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In this paper, we discuss packet filtering firewalls and an application level gateway approach used to secure handheld devices. We propose a firewall management plane as a means for crosslayer interaction. In our approach the application level gateway updates the firewall rules based on its knowledge about whether or not a certain source is sending malicious packets. Hereby, we pursue a policy of removing malicious packets as close as possible to the network interface. We show that in case of secure web service such a crosslayer interaction can significantly decrease the CPU load in case of attacks, i.e., if many malicious packets arrive at the handheld device. Our measurement results show that our crosslayer approach can reduce the CPU load caused by the application layer gateway by about 10-30%. Finally, we propose an integrated firewall processing approach that promises further improvements. It integrates the application controlled firewall before the MAC and provides crosslayer mechanisms to reduce the performance issues of traditional firewall approaches.