Simple Router in mininet
[Description]
In this lab, I will show how to add a router in mininet environment. Then each host that connects to the openvswitch can have different subnet IP address. With the aid of the router, the host with different subnet IP addresses can communicate with each other.
Case 1.
In the first case, there are three different subnets in one openvswitch, i.e. 10.0.1.0/24, 10.0.2.0/24, and 10.0.3.0/24. If different hosts in different subnets want to talk to each other, we should add one router in this environment, i.e. r1. Note that many different IP addresses can be set to one interface.
Case 2.
In the second case, there are two subnets, i.e. 10.0.1.0/24 and 10.0.2.0/24. These are subnets that are connected by one router, i.e. r1. In each subnet, there is one openvswitch. We want that h1 can talk to h2.
Case 3
In the second case, there are two subnets,
i.e. 10.0.1.0/24 and 10.0.2.0/24. These are subnets that are connected by one
router, i.e. r1. In each subnet, there is one openvswitch. We want that h1 can
talk to h2, h3, or h4.
[mininet script]
Case 1
|
from mininet.net import Mininet from mininet.node import Controller,
RemoteController, OVSKernelSwitch, UserSwitch from mininet.cli import CLI from mininet.log import setLogLevel from mininet.link import Link, TCLink def topology():
net = Mininet( controller=RemoteController, link=TCLink,
switch=OVSKernelSwitch ) #
Add hosts and switches h1
= net.addHost( 'h1', ip="10.0.1.10/24",
mac="00:00:00:00:00:01" ) h2 = net.addHost(
'h2', ip="10.0.2.10/24", mac="00:00:00:00:00:02" ) h3
= net.addHost( 'h3', ip="10.0.3.10/24",
mac="00:00:00:00:00:03" ) r1
= net.addHost( 'r1', mac="00:00:00:00:01:00" ) s1
= net.addSwitch( 's1') c0
= net.addController( 'c0', controller=RemoteController, ip='127.0.0.1',
port=6633 )
net.addLink( r1, s1 )
net.addLink( h1, s1 )
net.addLink( h2, s1 )
net.addLink( h3, s1 )
net.build()
c0.start()
s1.start( [c0] )
r1.cmd("ifconfig r1-eth0 0")
r1.cmd("ip addr add 10.0.1.1/24 brd + dev r1-eth0")
r1.cmd("ip addr add 10.0.2.1/24 brd + dev r1-eth0")
r1.cmd("ip addr add 10.0.3.1/24 brd + dev r1-eth0")
r1.cmd("echo 1 > /proc/sys/net/ipv4/ip_forward")
h1.cmd("ip route add default via 10.0.1.1")
h2.cmd("ip route add default via 10.0.2.1")
h3.cmd("ip route add default via 10.0.3.1") s1.cmd("ovs-ofctl add-flow s1 priority=1,arp,actions=flood")
s1.cmd("ovs-ofctl add-flow s1
priority=65535,ip,dl_dst=00:00:00:00:01:00,actions=output:1")
s1.cmd("ovs-ofctl add-flow s1
priority=10,ip,nw_dst=10.0.1.0/24,actions=output:2")
s1.cmd("ovs-ofctl add-flow s1
priority=10,ip,nw_dst=10.0.2.0/24,actions=output:3")
s1.cmd("ovs-ofctl add-flow s1
priority=10,ip,nw_dst=10.0.3.0/24,actions=output:4")
print "*** Running CLI"
CLI( net )
print "*** Stopping network"
net.stop() if __name__ == '__main__': setLogLevel( 'info' ) topology() |
[execution]
Case 2
|
from mininet.net import Mininet from mininet.node import Controller,
RemoteController, OVSKernelSwitch, UserSwitch from mininet.cli import CLI from mininet.log import setLogLevel from mininet.link import Link, TCLink def topology():
net = Mininet( controller=RemoteController, link=TCLink,
switch=OVSKernelSwitch ) #
Add hosts and switches h1
= net.addHost( 'h1', ip="10.0.1.10/24",
mac="00:00:00:00:00:01" ) h2
= net.addHost( 'h2', ip="10.0.2.10/24",
mac="00:00:00:00:00:02" ) r1
= net.addHost( 'r1') s1
= net.addSwitch( 's1') s2
= net.addSwitch( 's2') c0
= net.addController( 'c0', controller=RemoteController, ip='127.0.0.1',
port=6633 )
net.addLink( r1, s1 )
net.addLink( r1, s2 )
net.addLink( h1, s1 )
net.addLink( h2, s2 )
net.build()
c0.start()
s1.start( [c0] )
s2.start( [c0] )
r1.cmd("ifconfig r1-eth0 0")
r1.cmd("ifconfig r1-eth1 0")
r1.cmd("ifconfig r1-eth0 hw ether 00:00:00:00:01:01")
r1.cmd("ifconfig r1-eth1 hw ether 00:00:00:00:01:02")
r1.cmd("ip addr add 10.0.1.1/24 brd + dev r1-eth0")
r1.cmd("ip addr add 10.0.2.1/24 brd + dev r1-eth1")
r1.cmd("echo 1 > /proc/sys/net/ipv4/ip_forward")
h1.cmd("ip route add default via 10.0.1.1")
h2.cmd("ip route add default via 10.0.2.1") s1.cmd("ovs-ofctl add-flow s1 priority=1,arp,actions=flood")
s1.cmd("ovs-ofctl add-flow s1
priority=65535,ip,dl_dst=00:00:00:00:01:01,actions=output:1")
s1.cmd("ovs-ofctl add-flow s1
priority=10,ip,nw_dst=10.0.1.0/24,actions=output:2")
s2.cmd("ovs-ofctl add-flow s2 priority=1,arp,actions=flood")
s2.cmd("ovs-ofctl add-flow s2
priority=65535,ip,dl_dst=00:00:00:00:01:02,actions=output:1")
s2.cmd("ovs-ofctl add-flow s2
priority=10,ip,nw_dst=10.0.2.0/24,actions=output:2")
print "*** Running CLI"
CLI( net )
print "*** Stopping network"
net.stop() if __name__ == '__main__': setLogLevel( 'info' ) topology() |
[execution]
Case 3
|
from mininet.net import Mininet from mininet.node import Controller,
RemoteController, OVSKernelSwitch, UserSwitch from mininet.cli import CLI from mininet.log import setLogLevel from mininet.link import Link, TCLink def topology():
net = Mininet( controller=RemoteController, link=TCLink,
switch=OVSKernelSwitch ) #
Add hosts and switches h1
= net.addHost( 'h1', ip="10.0.1.10/24",
mac="00:00:00:00:00:01" ) h2
= net.addHost( 'h2', ip="10.0.2.10/24",
mac="00:00:00:00:00:02" ) h3 =
net.addHost( 'h3', ip="10.0.1.20/24",
mac="00:00:00:00:00:03" ) h4
= net.addHost( 'h4', ip="10.0.2.20/24",
mac="00:00:00:00:00:04" ) r1
= net.addHost( 'r1') s1
= net.addSwitch( 's1') s2
= net.addSwitch( 's2') c0
= net.addController( 'c0', controller=RemoteController, ip='127.0.0.1',
port=6633 )
net.addLink( r1, s1 )
net.addLink( r1, s2 )
net.addLink( h1, s1 )
net.addLink( h3, s1 )
net.addLink( h2, s2 ) net.addLink(
h4, s2 )
net.build()
c0.start()
s1.start( [c0] )
s2.start( [c0] )
r1.cmd("ifconfig r1-eth0 0")
r1.cmd("ifconfig r1-eth1 0")
r1.cmd("ifconfig r1-eth0 hw ether 00:00:00:00:01:01") r1.cmd("ifconfig
r1-eth1 hw ether 00:00:00:00:01:02")
r1.cmd("ip addr add 10.0.1.1/24 brd + dev r1-eth0")
r1.cmd("ip addr add 10.0.2.1/24 brd + dev r1-eth1")
r1.cmd("echo 1 > /proc/sys/net/ipv4/ip_forward")
h1.cmd("ip route add default via 10.0.1.1")
h2.cmd("ip route add default via 10.0.2.1")
h3.cmd("ip route add default via 10.0.1.1")
h4.cmd("ip route add default via 10.0.2.1") s1.cmd("ovs-ofctl add-flow s1
priority=1,arp,actions=flood") s1.cmd("ovs-ofctl add-flow
s1 priority=65535,ip,dl_dst=00:00:00:00:01:01,actions=output:1")
s1.cmd("ovs-ofctl add-flow s1
priority=10,ip,nw_dst=10.0.1.10,actions=output:2")
s1.cmd("ovs-ofctl add-flow s1
priority=10,ip,nw_dst=10.0.1.20,actions=output:3")
s2.cmd("ovs-ofctl add-flow s2 priority=1,arp,actions=flood")
s2.cmd("ovs-ofctl add-flow s2
priority=65535,ip,dl_dst=00:00:00:00:01:02,actions=output:1")
s2.cmd("ovs-ofctl add-flow s2
priority=10,ip,nw_dst=10.0.2.10,actions=output:2")
s2.cmd("ovs-ofctl add-flow s2
priority=10,ip,nw_dst=10.0.2.20,actions=output:3")
print "*** Running CLI"
CLI( net )
print "*** Stopping network"
net.stop() if __name__ == '__main__': setLogLevel( 'info' ) topology() |
[execution]
Dr. Chih-Heng Ke (smallko@gmail.com)
Department of Computer Science and Information
Engineering,
National Quemoy University, Kinmen, Taiwan.