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使用 mininet 构建一个简单的路由实验
网络拓扑结构如下:
Mininet 的拓扑定义代码:
from mininet.topo import Topo
class Router_Topo(Topo):
def __init__(self):
"Create P2P topology."
# Initialize topology
Topo.__init__(self)
# Add hosts and switches
H1 = self.addHost('h1')
H2 = self.addHost('h2')
H3 = self.addHost('h3')
S1 = self.addSwitch('s1')
S2 = self.addSwitch('s2')
# Add links
self.addLink(H1, S1)
self.addLink(H2, S1)
self.addLink(H2, S2)
self.addLink(H3, S2)
topos = {'router': (lambda: Router_Topo())
}
利用上面的脚本生成网络拓扑:
sudo mn --custom /home/mininet/Router.py --topo router
mininet> net
h1 h1-eth0:s1-eth1
h2 h2-eth0:s1-eth2 h2-eth1:s2-eth1
h3 h3-eth0:s2-eth2
s1 lo: s1-eth1:h1-eth0 s1-eth2:h2-eth0
s2 lo: s2-eth1:h2-eth1 s2-eth2:h3-eth0
为节点配置路由功能:
mininet> h1 ifconfig h1-eth0 192.168.12.1 netmask 255.255.255.0
mininet> h2 ifconfig h2-eth0 192.168.12.2 netmask 255.255.255.0
mininet> h2 ifconfig h2-eth1 192.168.23.2 netmask 255.255.255.0
mininet> h3 ifconfig h3-eth0 192.168.23.3 netmask 255.255.255.0
mininet> h1 route add default gw 192.168.12.2
mininet> h3 route add default gw 192.168.23.2
mininet> h2 sysctl net.ipv4.ip_forward=1
h1 看 ping 通 h3 了:
mininet> h1 ping -c 1 192.168.23.3
正文完
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