基于动态TCP代理的并行网络模拟性能研究

Research of Dynamic TCP Agent in Parallel Network Simulator

通过分析原始网络模拟器PDNS中TCP Agent层的静态架构,发现其存在的端口冲突、空占现象和服务无效问题。提出了基于动态TCP Agent策略的模型,通过对TCP数据的分流与动态创建和绑定TCP Agent的方法成功的解决了静态架构中出现的问题,同时有效的降低了内存占用量。通过模拟蠕虫扩散表明,动态策略实际产生的TCP Agent数目不到静态绑定策略的10%,模拟时间与静态策略近似。通过释放TCP Agent,实际存在的连接数目只占创建总数的70%左右。

By analyzing the original and static frame of TCP Agent in network simulator PDNS,problems of Port-Clash/RedundantMemory/Service-Invalid appeared.This paper presents a new frame using dynamic agent which can solve the problems and limitations by switching stream of different TCP connections and dynamically creating-binding agent.Experimental results of worm spreading show that dynamic method can decrease the amount of TCP Agents to less than 10% comparing to static method.Time cost is similar to the static method.By freeing TCP Agent,the amount of existing agents is more or less 70% of the created ones.