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Copy pathnatnet.py
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executable file
·69 lines (59 loc) · 1.93 KB
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#!/usr/bin/env python
"""
natnet.py: Example network with NATs
h0
|
s0
|
----------------
| |
nat1 nat2
| |
s1 s2
| |
h1 h2
"""
from mininet.topo import Topo
from mininet.net import Mininet
from mininet.nodelib import NAT
from mininet.log import setLogLevel
from mininet.cli import CLI
from mininet.util import irange
class InternetTopo(Topo):
"Single switch connected to n hosts."
# pylint: disable=arguments-differ
def build(self, n=2, **_kwargs ):
# set up inet switch
inetSwitch = self.addSwitch('s0')
# add inet host
inetHost = self.addHost('h0')
self.addLink(inetSwitch, inetHost)
# add local nets
for i in irange(1, n):
inetIntf = 'nat%d-eth0' % i
localIntf = 'nat%d-eth1' % i
localIP = '192.168.%d.1' % i
localSubnet = '192.168.%d.0/24' % i
natParams = { 'ip' : '%s/24' % localIP }
# add NAT to topology
nat = self.addNode('nat%d' % i, cls=NAT, subnet=localSubnet,
inetIntf=inetIntf, localIntf=localIntf)
switch = self.addSwitch('s%d' % i)
# connect NAT to inet and local switches
self.addLink(nat, inetSwitch, intfName1=inetIntf)
self.addLink(nat, switch, intfName1=localIntf, params1=natParams)
# add host and connect to local switch
host = self.addHost('h%d' % i,
ip='192.168.%d.100/24' % i,
defaultRoute='via %s' % localIP)
self.addLink(host, switch)
def run():
"Create network and run the CLI"
topo = InternetTopo()
net = Mininet(topo=topo, waitConnected=True )
net.start()
CLI(net)
net.stop()
if __name__ == '__main__':
setLogLevel('info')
run()