Today, attacks are a harmful element of the computer networks. Distributed Denial of Service (DDoS) attack is one of the most harmful attacks. Many defense mechanisms have been proposed to mitigate the effect of the attacks. 2In this thesis, we study two methods for defending against DDoS attacks. First, we identify the attack packets to detect a DDoS attack by checking the TTL value of incoming packets and monitoring the number of new source IP addresses of incoming packets. Second, we propose an algorithm to traceback the attack traffic to identify the source IP address of origin by deploying a tunneling based protocol. The tunneling based protocol is called the Locator/Identifier Separation Protocol (LISP) and it is deployed in a domain network to encapsulate all outgoing packets decapsulate all incoming packets. As a side-effect the tunneling protocol reveals the ingress point of attack traffic. We also analyzed the approach in a simulation environment and compare the results in the domain network when deploying the tunneling based protocol.
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