lantz
f0c726a42f
This helps with virtualenv although it can open up another security hole if you end up using an unexpected python interpreter. Overall it seems to make sense to err on the side of usability but it's good to be aware of security. However, for the remaining utility scripts that require python 2, we explicitly note this with #!/usr/bin/python2.
70 lines
1.9 KiB
Python
Executable File
70 lines
1.9 KiB
Python
Executable File
#!/usr/bin/env python
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"""
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natnet.py: Example network with NATs
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h0
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s0
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----------------
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nat1 nat2
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s1 s2
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h1 h2
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"""
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from mininet.topo import Topo
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from mininet.net import Mininet
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from mininet.nodelib import NAT
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from mininet.log import setLogLevel
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from mininet.cli import CLI
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from mininet.util import irange
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class InternetTopo(Topo):
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"Single switch connected to n hosts."
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# pylint: disable=arguments-differ
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def build(self, n=2, **_kwargs ):
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# set up inet switch
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inetSwitch = self.addSwitch('s0')
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# add inet host
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inetHost = self.addHost('h0')
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self.addLink(inetSwitch, inetHost)
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# add local nets
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for i in irange(1, n):
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inetIntf = 'nat%d-eth0' % i
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localIntf = 'nat%d-eth1' % i
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localIP = '192.168.%d.1' % i
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localSubnet = '192.168.%d.0/24' % i
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natParams = { 'ip' : '%s/24' % localIP }
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# add NAT to topology
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nat = self.addNode('nat%d' % i, cls=NAT, subnet=localSubnet,
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inetIntf=inetIntf, localIntf=localIntf)
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switch = self.addSwitch('s%d' % i)
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# connect NAT to inet and local switches
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self.addLink(nat, inetSwitch, intfName1=inetIntf)
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self.addLink(nat, switch, intfName1=localIntf, params1=natParams)
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# add host and connect to local switch
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host = self.addHost('h%d' % i,
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ip='192.168.%d.100/24' % i,
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defaultRoute='via %s' % localIP)
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self.addLink(host, switch)
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def run():
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"Create network and run the CLI"
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topo = InternetTopo()
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net = Mininet(topo=topo, waitConnected=True )
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net.start()
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CLI(net)
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net.stop()
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if __name__ == '__main__':
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setLogLevel('info')
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run()
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