一、实验目的
能够运用 wireshark 对 OpenFlow 协议数据交互过程进行抓包；
能够借助包解析工具，分析与解释 OpenFlow协议的数据包交互过程与机制。
二、实验环境
下载虚拟机软件Oracle VisualBox；
在虚拟机中安装Ubuntu 20.04 Desktop amd64，并完整安装Mininet；
三、实验要求
（一）基本要求
搭建下图所示拓扑，完成相关 IP 配置，并实现主机与主机之间的 IP 通信。用抓包软件获取控制器与交换机之间的通信数据包。
主机 IP地址
h1 192.168.0.101/24
h2 192.168.0.102/24
h3 192.168.0.103/24
h4 192.168.0.104/24
查看抓包结果，分析OpenFlow协议中交换机与控制器的消息交互过程，画出相关交互图或流程图。
hello
控制器6633端口（我最高能支持OpenFlow 1.0） ---> 交换机47688端口
交换机47688端口（我最高能支持OpenFlow 1.3）---> 控制器6633端口
于是双方建立连接，并使用OpenFlow 1.0
Features Request / Set Conig
控制器6633端口（我需要你的特征信息） ---> 交换机47688端口
控制器6633端口（请按照我给你的flag和max bytes of packet进行配置） ---> 交换机47688端口
Port_Status
当交换机端口发生变化时，告知控制器相应的端口状态。
Features Reply
交换机47688端口（这是我的特征信息，请查收）--- 控制器6633端口
Packet_in
• 有两种情况： • 交换机查找流表，发现没有匹配条目时
• 有匹配条目但是对应的action是OUTPUT=CONTROLLER时
交换机35534端口（有数据包进来，请指示）--- 控制器6633端口
Flow_mod
分析抓取的flow_mod数据包，控制器通过6633端口向交换机端口、交换机
47688端口下发流表项，指导数据的转发处理
Packet_out
控制器6633端口（请按照我给你的action进行处理） ---> 交换机47688端口
回答问题：交换机与控制器建立通信时是使用TCP协议还是UDP协议？
答： tcp协议
点击查看代码
{
"application": {
"dpctl": "",
"ipBase": "10.0.0.0/8",
"netflow": {
"nflowAddId": "0",
"nflowTarget": "",
"nflowTimeout": "600"
},
"openFlowVersions": {
"ovsOf10": "1",
"ovsOf11": "1",
"ovsOf12": "1",
"ovsOf13": "1"
},
"sflow": {
"sflowHeader": "128",
"sflowPolling": "30",
"sflowSampling": "400",
"sflowTarget": ""
},
"startCLI": "1",
"switchType": "ovs",
"terminalType": "xterm"
},
"controllers": [
{
"opts": {
"controllerProtocol": "tcp",
"controllerType": "ref",
"hostname": "c0",
"remoteIP": "127.0.0.1",
"remotePort": 6633
},
"x": "314.0",
"y": "150.0"
}
],
"hosts": [
{
"number": "1",
"opts": {
"defaultRoute": "255.255.255.0",
"hostname": "h1",
"ip": "192.168.0.101",
"nodeNum": 1,
"sched": "host"
},
"x": "137.0",
"y": "235.0"
},
{
"number": "2",
"opts": {
"hostname": "h2",
"ip": "192.168.0.102",
"nodeNum": 2,
"sched": "host"
},
"x": "142.0",
"y": "395.0"
},
{
"number": "3",
"opts": {
"hostname": "h3",
"ip": "192.168.0.103",
"nodeNum": 3,
"sched": "host"
},
"x": "536.0",
"y": "225.0"
},
{
"number": "4",
"opts": {
"hostname": "h4",
"ip": "192.168.0.104",
"nodeNum": 4,
"sched": "host"
},
"x": "524.0",
"y": "399.0"
}
],
"links": [
{
"dest": "s1",
"opts": {},
"src": "h1"
},
{
"dest": "s1",
"opts": {},
"src": "h2"
},
{
"dest": "s2",
"opts": {},
"src": "h3"
},
{
"dest": "s2",
"opts": {},
"src": "h4"
},
{
"dest": "s2",
"opts": {},
"src": "s1"
}
],
"switches": [
{
"number": "1",
"opts": {
"controllers": [
"c0"
],
"hostname": "s1",
"nodeNum": 1,
"switchType": "default"
},
"x": "243.0",
"y": "316.0"
},
{
"number": "2",
"opts": {
"controllers": [
"c0"
],
"hostname": "s2",
"nodeNum": 2,
"switchType": "default"
},
"x": "415.0",
"y": "315.0"
}
],
"version": "2"