lantz
b7c412073a
Ubuntu 20.04 fixes:
- fixes sshd test
- speeds up examples/{treeping64,tree1024}.py
- debugging hacks/output for testLinkChange
- removes cfs from examples/popen.py
- improves nat in nodelib (netplan fixes?)
- makes some tests executable
- waits for switches to connect in tests to
avoid race conditions
-- adds mn -w option and wait CLI command
Changes:
- REMOVES default "-v" argument for Controller()
and adds verbose(=False) option; avoiding logging
makes it faster
- CHANGES waitConnected to wait for 5 seconds
as documented; we may wish to implement an argument
to -w to set this timeout
Issues?
- There may still be an issue with the ovs-netplan-clean
service causing the boot to hang ;-(
93 lines
2.8 KiB
Python
Executable File
93 lines
2.8 KiB
Python
Executable File
#!/usr/bin/python
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"""
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linuxrouter.py: Example network with Linux IP router
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This example converts a Node into a router using IP forwarding
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already built into Linux.
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The example topology creates a router and three IP subnets:
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- 192.168.1.0/24 (r0-eth1, IP: 192.168.1.1)
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- 172.16.0.0/12 (r0-eth2, IP: 172.16.0.1)
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- 10.0.0.0/8 (r0-eth3, IP: 10.0.0.1)
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Each subnet consists of a single host connected to
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a single switch:
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r0-eth1 - s1-eth1 - h1-eth0 (IP: 192.168.1.100)
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r0-eth2 - s2-eth1 - h2-eth0 (IP: 172.16.0.100)
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r0-eth3 - s3-eth1 - h3-eth0 (IP: 10.0.0.100)
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The example relies on default routing entries that are
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automatically created for each router interface, as well
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as 'defaultRoute' parameters for the host interfaces.
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Additional routes may be added to the router or hosts by
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executing 'ip route' or 'route' commands on the router or hosts.
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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.node import Node
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from mininet.log import setLogLevel, info
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from mininet.cli import CLI
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class LinuxRouter( Node ):
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"A Node with IP forwarding enabled."
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def config( self, **params ):
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super( LinuxRouter, self).config( **params )
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# Enable forwarding on the router
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self.cmd( 'sysctl net.ipv4.ip_forward=1' )
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def terminate( self ):
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self.cmd( 'sysctl net.ipv4.ip_forward=0' )
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super( LinuxRouter, self ).terminate()
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class NetworkTopo( Topo ):
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"A LinuxRouter connecting three IP subnets"
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def build( self, **_opts ):
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defaultIP = '192.168.1.1/24' # IP address for r0-eth1
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router = self.addNode( 'r0', cls=LinuxRouter, ip=defaultIP )
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s1, s2, s3 = [ self.addSwitch( s ) for s in ( 's1', 's2', 's3' ) ]
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self.addLink( s1, router, intfName2='r0-eth1',
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params2={ 'ip' : defaultIP } ) # for clarity
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self.addLink( s2, router, intfName2='r0-eth2',
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params2={ 'ip' : '172.16.0.1/12' } )
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self.addLink( s3, router, intfName2='r0-eth3',
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params2={ 'ip' : '10.0.0.1/8' } )
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h1 = self.addHost( 'h1', ip='192.168.1.100/24',
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defaultRoute='via 192.168.1.1' )
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h2 = self.addHost( 'h2', ip='172.16.0.100/12',
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defaultRoute='via 172.16.0.1' )
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h3 = self.addHost( 'h3', ip='10.0.0.100/8',
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defaultRoute='via 10.0.0.1' )
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for h, s in [ (h1, s1), (h2, s2), (h3, s3) ]:
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self.addLink( h, s )
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def run():
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"Test linux router"
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topo = NetworkTopo()
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net = Mininet( topo=topo,
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waitConnected=True ) # controller is used by s1-s3
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net.start()
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info( '*** Routing Table on Router:\n' )
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info( net[ 'r0' ].cmd( 'route' ) )
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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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