Abstract: Network coding has received extensive research attention, but the Simulation research on popular network simulators is few. Most of current network simulators were designed to simulate traditional networks,where nodes can only copy and forward packets only. While in the paradigm of network coding, nodes can perform coding operations on packets. The extension for network coding is fundamental for further simulation study. We analyzed the structure of NS firstly, and identified the parts that should be modified to suit for network coding. I}hen we proposed and implemented the extension. At last, simulation experiment on basic network was performed to verify the availability of the extension.

Key words: Network simulator, Network coding, Linear coding, NS