小编D.A*_*ple的帖子

该场景由两个相互连接的路由器r1-r2组成（我在Mininet给出的示例中找到了LinuxRouter类）。将 3 台主机连接到 r1，每台主机属于不同的子网，网络 ping 正常。

class LinuxRouter( Node ):

    def config( self, **params ):
        super( LinuxRouter, self).config( **params )
        self.cmd( 'sysctl net.ipv4.ip_forward=1' )

    def terminate( self ):
        self.cmd( 'sysctl net.ipv4.ip_forward=0' )
        super( LinuxRouter, self ).terminate()


class NetworkTopo( Topo ):

    def build( self, **_opts ):
        r1 = self.addNode( 'r1', cls=LinuxRouter, ip='192.168.1.1/24' )
        s1, s2, s3, s4= [ self.addSwitch( s ) for s in ( 's1', 's2', 's3','s4') ]

        self.addLink( s1, r1, intfName2='r1-eth1', params2={ 'ip' : '192.168.1.1/24' } )  
        self.addLink( s2, …