mininet with running example

MininetSDN.py

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+import configparser
+from mininet.net	import Mininet
+from mininet.topo	import Topo
+from mininet.node	import Node
+from mininet.cli	import CLI
+from mininet.link	import TCLink
+from mininet.log	import setLogLevel
+
+class MyRouter (Node):
+	def config(self, **params):
+		super(MyRouter, self).config(**params)
+		self.cmd('sysctl net.ipv4.ip_forward=1')		#Enable forwarding on the router
+	def terminate(self):
+		self.cmd('sysctl net.ipv4.ip_forward=0')		#Disable forwarding on the router
+		super(MyRouter, self).terminate
+
+def build_topology(config_file):
+	topo = Topo()
+
+	with open(config_file, 'r') as file:
+		for line in file:
+			line = line.strip()
+			if line.startswith('#'):		#Skip comment
+				continue
+
+			parts = line.split(" ")		#Parse the topology file using spaces
+			if parts[0] == 'host':		#Parse hosts
+				host_name = parts[1]
+				host_ip = parts[2]
+				host_nexthop = 'via ' + parts[3]
+				topo.addHost(host_name, ip=host_ip, defaultRoute=host_nexthop)
+
+			elif parts[0] == 'router':		#Parse routers
+				router_name = parts[1]
+				router_ip = parts[2]
+				topo.addNode(router_name, cls=MyRouter, ip=router_ip)
+
+			elif parts[0] == 'switch':		#Parse switches
+				switch_name = parts[1]
+				topo.addSwitch(switch_name)
+
+			elif parts[0] == 'linkSH':		#Parse links switches to hosts
+				node1 = parts[1]
+				node2 = parts[2]
+				topo.addLink(node1, node2)
+
+			elif parts[0] == 'linkSS':		#Parse links switches to switches
+				node1 = parts[1]
+				node2 = parts[2]
+				topo.addLink(node1, node2)
+
+			elif parts[0] == 'linkHR':		#Parse links hosts to routers
+				node1 = parts[1]
+				node2 = parts[2]
+				intf_name2 = parts[3]
+				n2_ip = parts[4]
+				topo.addLink(node1, node2, intfName2=intf_name2, params2={'ip' : n2_ip})
+
+			elif parts[0] == 'linkRR':		#Parse links routers to routers
+				node1 = parts[1]
+				node2 = parts[2]
+				intf_name1 = parts[3]
+				intf_name2 = parts[4]
+				ip1 = parts[5]
+				ip2 = parts[6]
+				topo.addLink(node1, node2, intfName1=intf_name1, intfName2=intf_name2, params1={'ip' : ip1}, params2={'ip' : ip2})
+			
+			# elif parts[0] == 'route':		#Parse routing tables
+			# 	name = parts[1]
+			# 	for node in topo.nodes():
+			# 		if node == name:
+			# 			(node).cmd('ip route add 0.0.0.0/0 via 10.0.0.1 dev r1-eth2')
+			# 			break
+
+
+
+			# (topo.getNodeByName('r1')).cmd('ip route add 0.0.0.0/0 via 10.0.0.1 dev r1-eth2')
+	return topo
+
+def run_topology(config_file):
+	setLogLevel('info')		#Different logging levels are 'info' 'warning' 'error' 'debug'
+	topo = build_topology(config_file)
+	net = Mininet(topo=topo, link=TCLink)
+	net.start()		#Starting the network
+
+	with open(config_file, 'r') as file:		#Search in the configuration file for routing table
+		for line in file:
+			line = line.strip()
+			if line.startswith('#'):		#Skip comment
+				continue
+
+			parts = line.split(" ")
+			if parts[0] == 'route':		#Parse routing tables
+				name = parts[1]
+				pck_src = parts[2]
+				pck_nexthop = parts[3]
+				interf = parts[4]
+				cmd = 'ip route add ' + pck_src + ' via ' + pck_nexthop + ' dev ' + interf
+				(net.getNodeByName(name)).cmd(cmd)
+	net.pingAll()
+	# CLI(net)
+	net.stop()		#Stopping the network
+
+if __name__ == '__main__':
+	run_topology('MininetTopo.conf')

MininetTopo.conf

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+######## Set hosts ########
+## host name ip defRoute ##
+###########################
+host h1 10.1.0.2/24 10.1.0.1
+host h2 10.2.0.2/24 10.2.0.1
+# host h3 10.3.0.2/24 10.2.0.1
+# host h4 10.4.0.2/24 10.2.0.1
+
+#### Set routers ###
+## router name ip ##
+####################
+router r1 10.1.0.1/24
+router r2 10.2.0.1/24
+
+## Set switches ##
+##  switch name ##
+##################
+# switch s1
+# switch s2
+
+####### Set links #######
+## linkSH switch, host ##
+#########################
+# linkSH s1 h1
+# linkSH s1 h2
+# linkSH s2 h3
+# linkSH s2 h4
+
+######### Set links #########
+## linkSS switch1, switch2 ##
+#############################
+# linkSS s2 s1
+
+
+##################### Set links #####################
+## linkHR host, router, router_intfName, router_ip ##
+#####################################################
+linkHR h1 r1 r1-eth1 10.1.0.1/24
+linkHR h2 r2 r2-eth1 10.2.0.1/24
+# linkRR h1 r1 h1-eth0 r1-eth0 10.0.0.2/24 10.0.0.1/24
+# linkRR h2 r2 h2-eth0 r2-eth0 10.0.1.2/24 10.0.1.1/24
+
+######################### Set links #########################
+## linkRR router1, router2, intfName1, intfName2, ip1, ip2 ##
+#############################################################
+linkRR r1 r2 r1-eth2 r2-eth2 10.0.0.0/31 10.0.0.1/31
+
+############# route  table #############
+## route name source destRoute interf ##
+########################################
+route r1 0.0.0.0/0 10.0.0.1 r1-eth2
+route r2 0.0.0.0/0 10.0.0.0 r2-eth2

setup.txt

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+# Usefull to know
+# sudo fuser -k 6653/tcp
+# sudo mn -c
+
+
+Per far funzionare le cose serve:
+
+sudo apt-get install python3
+python3 --version		//This command should display the version of Python 3.x that was installed
+
+sudo apt-get install openvswitch-testcontroller //non serve davvero
+sudo apt-get install python3-pip
+sudo pip3 install configparser
+sudo apt-get install mininet