Detection and Defence Against TCP SYN Food Attacks

Abstract

Over the years, the Internet has evolved from a tool for the research community to an indispensable network connecting over a billion nodes worldwide. Nowadays network growing in a rampant manner and uses as transfer medium like data, money transaction, information etc. Even though internet plays a vital role still there is some vulnerability eg. virus, spam, hacking, DOS, DDos, etc. There are many security threats existing on the Internet, one of them is the TCP SYN flood attack. We are focusing on Distributed Denial of Service; out of plenty of Denial of Service mechanism, we took SYN Flood attacks. In this report , we will study the effect of denial-of-service attacks arising from TCP SYN flooding. SYN flooding attack has been widely observed world-wide, and occupies about 90% of the DoS attacks. We examine the effects of the attacks on individual host with the help of some useful parameters. We will detect the attack using ns2 tool .We will also compare the results of both the scenarios ,before and after the attack. Then, we will design the tool to prevent such attacks. The tool will contain the application of different algorithms and comparison of different approaches to fina an efficient defence algorithm against the TCP SYN flood attacks. Finally, we will deduce the results which will detect and defend such TCP SYN flood attacks.