[英](mininet) How to create a topology with two routers and their respective hosts
該場景由兩個相互連接的路由器 r1-r2 組成(我在 Mininet 給出的示例中找到了 LinuxRouter 類)。 將 3 台主機連接到 r1,每台主機都屬於不同的子網,網絡 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, r1, intfName2='r1-eth2', params2={ 'ip' : '172.16.0.1/12' } )
self.addLink( s3, r1, intfName2='r1-eth3', params2={ 'ip' : '10.0.0.1/8' } )
self.addLink( s4, r1, intfName2='r1-eth4', params2={ 'ip' : '5.5.5.1/16' } )
h1 = self.addHost( 'h1', ip='192.168.1.100/24', defaultRoute='via 192.168.1.1' )
h2 = self.addHost( 'h2', ip='172.16.0.100/12', defaultRoute='via 172.16.0.1' )
h3 = self.addHost( 'h3', ip='10.0.0.100/8', defaultRoute='via 10.0.0.1' )
r2 = self.addNode( 'r2',cls=LinuxRouter,ip='5.5.5.100/16', defaultRoute='via 5.5.5.1' )
for h, s in [ (h1, s1), (h2, s2), (h3, s3) ]:
self.addLink( h, s)
self.addLink(r2,s4)
def run():
topo = NetworkTopo()
net = Mininet( topo=topo)
net.start()
CLI( net )
net.stop()
if __name__ == '__main__':
setLogLevel( 'info' )
run()
如果我嘗試將主機(我們稱之為 h4)添加到 r2,就像我為其他主機所做的那樣(添加一個交換機,s4,就像 r2--s4--h4),它無法 ping。 我該如何管理?
讓我們將問題簡化為最簡單的拓撲結構,您可以使用 2 台路由器、2 台交換機和 2 台主機。
使用此工具創建的圖像。
這是創建此拓撲的 Mininet 修改后的linuxrouter.py
。 (刪除了默認的文檔字符串和注釋,並添加了新的相關內容。)
這適用於以下 Mininet VM 版本: mininet-2.2.2-170321-ubuntu-14.04.4-server
#!/usr/bin/python
from mininet.topo import Topo
from mininet.net import Mininet
from mininet.node import Node
from mininet.log import setLogLevel, info
from mininet.cli import CLI
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):
# Add 2 routers in two different subnets
r1 = self.addHost('r1', cls=LinuxRouter, ip='10.0.0.1/24')
r2 = self.addHost('r2', cls=LinuxRouter, ip='10.1.0.1/24')
# Add 2 switches
s1 = self.addSwitch('s1')
s2 = self.addSwitch('s2')
# Add host-switch links in the same subnet
self.addLink(s1,
r1,
intfName2='r1-eth1',
params2={'ip': '10.0.0.1/24'})
self.addLink(s2,
r2,
intfName2='r2-eth1',
params2={'ip': '10.1.0.1/24'})
# Add router-router link in a new subnet for the router-router connection
self.addLink(r1,
r2,
intfName1='r1-eth2',
intfName2='r2-eth2',
params1={'ip': '10.100.0.1/24'},
params2={'ip': '10.100.0.2/24'})
# Adding hosts specifying the default route
d1 = self.addHost(name='d1',
ip='10.0.0.251/24',
defaultRoute='via 10.0.0.1')
d2 = self.addHost(name='d2',
ip='10.1.0.252/24',
defaultRoute='via 10.1.0.1')
# Add host-switch links
self.addLink(d1, s1)
self.addLink(d2, s2)
def run():
topo = NetworkTopo()
net = Mininet(topo=topo)
# Add routing for reaching networks that aren't directly connected
info(net['r1'].cmd("ip route add 10.1.0.0/24 via 10.100.0.2 dev r1-eth2"))
info(net['r2'].cmd("ip route add 10.0.0.0/24 via 10.100.0.1 dev r2-eth2"))
net.start()
CLI(net)
net.stop()
if __name__ == '__main__':
setLogLevel('info')
run()
回顧:您有兩個網絡 10.0.0.0/24 和 10.1.0.0/24,它們使用網絡 10.100.0.0/24 通過 2 個路由器連接。
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