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International Journal of Distributed Sensor Networks
Volume 2012 (2012), Article ID 684180, 7 pages
Research Article

Improving DNS Security Using Active Firewalling with Network Probes

1Foundation for National Scientific Computing, Avenue Brazil no. 101, 1700-066 Lisbon, Portugal
2Department of Informatics, University of Lisbon, Edifício C6, Campo-Grande, 1749-016 Lisbon, Portugal

Received 13 December 2011; Accepted 23 March 2012

Academic Editor: James Park

Copyright © 2012 Joao Afonso and Pedro Veiga. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.


The security problems that outbreak network services today are increasing at a dramatic pace especially with the unceasing improvement of network transmission rates and the sheer amount of data exchanged. This translates not only more incidents but also new types of attacks with network incidents becoming more and more frequent. A significant part of the attacks occurs at Top Level Domains (TLDs) who have the assignment of ensuring the correct functioning of Domain Name System (DNS) zones. The proposed solution has been developed and tested at FCCN (Foundation for National Scientific Computing), the TLD manager for the .PT domain. The system consists of network sensors that monitor the network in real-time and can dynamically detect, prevent, or limit the scope of the attempted intrusions or other types of attacks to the DNS service, thus improving its global availability.