最近在做靜態路由轉發實驗(計算機網絡課程實驗),實驗課程給出了一定的代碼,不過老師在實驗上挖了一些坑需要我們填補。
先貼出實驗代碼:
#!/usr/bin/python
from mininet.topo import Topo
from mininet.net import Mininet
from mininet.cli import CLI
class RouterTopo(Topo):
def build(self):
h1 = self.addHost('h1')
h2 = self.addHost('h2')
h3 = self.addHost('h3')
r1 = self.addHost('r1')
self.addLink(h1, r1)
self.addLink(h2, r1)
self.addLink(h3, r1)
if __name__ == '__main__':
topo = RouterTopo()
net = Mininet(topo = topo, controller = None)
h1, h2, h3, r1 = net.get('h1', 'h2', 'h3', 'r1')
h1.cmd('ifconfig h1-eth0 10.0.1.11/24')
h2.cmd('ifconfig h2-eth0 10.0.2.22/24')
h3.cmd('ifconfig h3-eth0 10.0.3.33/24')
h1.cmd('route add default gw 10.0.1.1')
h2.cmd('route add default gw 10.0.2.1')
h3.cmd('route add default gw 10.0.3.1')
for h in (h1, h2, h3):
h.cmd('./scripts/disable_offloading.sh')
h.cmd('./scripts/disable_ipv6.sh')
r1.cmd('ifconfig r1-eth0 10.0.1.1/24')
r1.cmd('ifconfig r1-eth1 10.0.2.1/24')
r1.cmd('ifconfig r1-eth2 10.0.3.1/24')
r1.cmd('./scripts/disable_arp.sh')
r1.cmd('./scripts/disable_icmp.sh')
r1.cmd('./scripts/disable_ip_forward.sh')
net.start()
CLI(net)
net.stop()
在Ubuntu下運行該router_topo.py程序時,使用命令sudo mn --custom router_topo.py --topo router 出現了invalid topo name錯誤。截圖如下:
後面查看stackflow後解決了該問題。
在class RouterTopo定義前添加一行TOPOS = {'router':(lambda:RouterTopo())}
這樣就可以解決了,注意不要縮進。成功截圖如下: