The primary issue with developing new networking protocols is testing how the protocol will behave when deployed on a large scale; of particular interest is how it will interact with existing protocols. Testing a protocol using a network simulator has drawbacks. First, the protocol must be written for the simulator and then rewritten for actual deployment. Aside from the additional work, this allows for software bugs to be introduced between testing and implementation. More importantly, there are correctness issues. Since both the new and existing protocols must be specially written for the simulator, and not actual real-world implementations, the question remains if the behavior observed and, specifically, the interactions between the protocols are valid. Direct code execution environments solve the correctness problem, but there is the loss of control that a simulator provides. Our solution is to create an environment that allows direct code execution to occur on top of a network simulator. This thesis presents the primary component of that solution: Lunar (Linux User-level Network Architecture), a user-level library that is created from the network stack portion of the Linux operating system. This allows real-world applications to link against a simulator, with Lunar serving as the bridge. For this work, an implementation of Lunar was constructed using the 2.4.3 version of the Linux kernel. Verification testing was performed to demonstrate correct functioning of the library using both TCP (including TCP with loss) and UDP. Performance testing was done to measure the overhead that Lunar adds to a running application. Overhead was measured as the percent increase in the runtime of an application with Lunar as compared to the application running without it, and ranged from approximately 2% (running over 100 Mbps switched Ethernet) to approximately 39% (1 Gbps Myrinet). / Master of Science

Purpose of this master thesis was to explain simulation of real network, point to the imperfection during these simulations and try to find out technologies and solutions that could improve credibility of simulation. For this purpose, network simulator ns-3 has been chosen which supports direct code execution together with Quagga software suite. Master thesis describes internet protocol IPv4, UDP protocol, basics of routing and detailed explanation of OSPF routing protocol. Focus in this thesis is also on general description of simulation, its kinds and detail explanation of discrete simulation that is used by ns-3 simulator. Next chapter explains theory of ns-3 simulator, its development, conceptual overview and objects. Direct code execution and Quagga that both help improve credibility of simulation, are described in last chapter of theoretical part of thesis. In practical part of thesis is explained how to install and configure all three implemantaions of ns-3 simulator on Ubuntu, linux distribution. On the basis of obtained knowledge, the simulation model has been designed, also there has been given detailed explanation of how to create new model of simulation and how to analyze its results for all implementation.

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