本文主要描述如何在mininet配置下图所示的拓扑，让h1和h2能够通信。拓扑的可视化界面生成请参考上篇论文。
具体的主机ip和路由配置如下：
完整的拓扑代码如下,注意：我一开始将r1-eth1设置为10.0.2.0，r2-eth0设置为10.0.2.1，个人认为没什么问题，但是总是ping不通，于是将两个接口的ip换成了172.16.2.*就成功了，非常迷惑，如果有了解的大佬可以在评论区留言交流一下：
#!/usr/bin/python from mininet.net import Mininet from mininet.node import Controller, RemoteController, OVSController from mininet.node import CPULimitedHost, Host, Node from mininet.node import OVSKernelSwitch, UserSwitch from mininet.node import IVSSwitch from mininet.cli import CLI from mininet.log import setLogLevel, info from mininet.link import TCLink, Intf from subprocess import call def myNetwork(): net = Mininet( topo=None, build=False, ipBase='10.0.0.0/8') info( '*** Adding controller\n' ) info( '*** Add switches\n') r1 = net.addHost('r1', cls=Node, ip='0.0.0.0') r2 = net.addHost('r2', cls=Node, ip='0.0.0.0') info( '*** Add hosts\n') h1 = net.addHost('h1', cls=Host, ip='10.0.0.2/24', defaultRoute=None) h2 = net.addHost('h2', cls=Host, ip='10.0.1.2/24', defaultRoute=None) info( '*** Add links\n') net.addLink(h1, r1) net.addLink(r1, r2) net.addLink(r2, h2) info( '*** Starting network\n') net.build() info( '*** Starting controllers\n') for controller in net.controllers: controller.start() info( '*** Starting switches\n') info( '*** Post configure switches and hosts\n') h1.cmd('ifconfig h1-eth0 10.0.0.2/24') h2.cmd('ifconfig h2-eth0 10.0.1.2/24') r1.cmd('ifconfig r1-eth0 10.0.0.1/24') r1.cmd('ifconfig r1-eth1 172.16.2.1/24') r2.cmd('ifconfig r2-eth0 172.16.2.2/24') r2.cmd('ifconfig r2-eth1 10.0.1.1/24') r1.cmd('route add -net 10.0.1.0/24 gw 172.16.2.2') r2.cmd('route add -net 10.0.0.0/24 gw 172.16.2.1') h1.cmd('route add default gw 10.0.0.1') h2.cmd('route add default gw 10.0.1.1') r1.cmd('sysctl -w net.ipv4.ip_forward=1') r2.cmd('sysctl -w net.ipv4.ip_forward=1') CLI(net) net.stop() if __name__ == '__main__': setLogLevel( 'info' ) myNetwork()最终的结果如下：
