# ns2_TeAOMDV
一个基于ns2网络模拟,对AOMDV协议进行修改,形成的带信任评估、按需、多路径协议的小课题,基于elsevier期刊https://www.sciencedirect.com/science/article/pii/S1084804515002982
1,模拟机制<br>
每个节点都仿佛是一个独立的线程,节点与其它节点的接触,无非发包和收包。<br>
顺着时间轴,模拟各种事件的发生。<br>
<br>
2,代码模拟过程<br>
仅看AODV所在的层,收到一个包都会经历以下流程(如果自己是源点,那么会收到来自应用层的数据包):<br>
最先是Recv函数收到包,Recv函数收到一个指向一个包的指针作为实参,如果是控制包(PT_AODV),则交给RecvAODV();是数据包就交给Resolve()去解析。<br>
在Resolve()中,会判断是否会有可用的路由,有的话会将包传给forward()(下面转发包都是调用这个函数),接着进入调度队列;没有的话,则先将包放入缓存队列中,然后调用sendRequest(),然后就会向周围广播请求包,请求建立到目的节点的路由。<br>
在RecvAODV()中,还会根据控制包的类型,进一步调用不同的函数,常用的包类型有Request请求包,Reply答复包。如果收到Request包,如果自己不是目的地,也没有通向目的地的路由,那么就接着广播转发Request包;反之,则发送Reply包到<b>上一跳</b>(发给它Request包的节点),表示已经找到目的节点了,就这样上一跳又以单播发Reply给上上一跳...直到源点收到Reply,便建立了路由。<br>
<br>
当然,收包的时候会做一系列判断,不接受过期的包(ttl为0),重复的包?不能让包的发送形成环路。<br>
<br>
除了应用层发包,在AODV里也可以设置定时器,自己定时发送包,比如hello包就可以当作一个模板,发包事件最后会放到调度队列,最好设置一个随机delay,不然同一时刻有很多事件要执行,而会发生有一部分事件不会被执行,还需要注意的是,放入调度队列的包不要调用free(),不然会引发段错误。<br>
<br>
3,混杂监听<br>
tap监测(本来如果某个单播包的接收节点不是自己,那么这个包不会来到AODV所在的层次来,加了这个就能来了)<br>
<br>
4,测数据,调参数<br>
/datatest<br>
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温馨提示
一个基于ns2网络模拟,对AOMDV协议进行修改,形成的带信任评估、按需、多路径协议的小课题 针对基于NS-2网络模拟,对AOMDV(Ad hoc On-Demand Multicast Routing Protocol)协议进行修改,形成一个带信任评估、按需、多路径的新协议的小课题,以下是一些建议和步骤: 1. **需求分析**: - 明确你希望改进AOMDV协议的方面,如效率、鲁棒性、安全性等。 - 确定添加的新特性,如信任评估机制、多路径选择等。 2. **协议研究**: - 深入研究AOMDV协议的工作原理和报文格式。 - 了解多路径路由协议的原理,以及如何将信任评估机制集成到路由协议中。 3. **NS-2模拟环境搭建**: - 安装NS-2模拟器。 - 准备必要的NS-2脚本和模块,以支持网络模拟和协议测试。 4. **协议修改与实现**: - 在NS-2中实现或修改AOMDV协议,以支持信任评估和多路径选择。 - 设计信任评估机制,可以是基于节点的行为、历史表现或者其他指标。 - 实现多路径选择算法,如最短路径优先、负
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