Theses and Dissertations - UTB/UTPA

Date of Award


Document Type


Degree Name

Master of Science (MS)


Computer Science

First Advisor

Dr. Sanjeev Kumar

Second Advisor

Dr. Weidong Kuang

Third Advisor

Dr. Jun Peng


Securing server from Distributed denial of service (DDoS) attacks is a challenging task for network operators. DDOS attacks are known to reduce the performance of web based applications and reduce the number of legitimate client connections. In this thesis, we evaluate performance of a Windows server 2003 under these attacks. In this thesis, we also evaluate and compare effectiveness of three different protection mechanisms, namely SYN Cache, SYN Cookie and SYN proxy protection methods, to protect against TCP SYN DDoS attacks. It is found that the SYN attack protection at the server is more effective at lower loads of SYN attack traffic, whereas the SYN cookies protection is more effective at higher loads compared to other methods.


Copyright 2009 Hari Krishna Vellalacheruvu. All Rights Reserved.

Granting Institution

University of Texas-Pan American