[pox-dev] Mininet Script for Pox Router Example

William Emmanuel Yu wyu at ateneo.edu
Sun Sep 30 21:52:09 PDT 2012 

Hi,

I am in the process of writing an exercise for creating a simple static
router in POX. I have created the following topology script in Mininet:

from mininet.net import Mininet
from mininet.node import Controller, OVSKernelSwitch, RemoteController
from mininet.cli import CLI
from mininet.log import setLogLevel, info
from mininet.util import createLink

    # Create an empty network.
    net = Mininet(controller=RemoteController, switch=OVSKernelSwitch)
    net.addController('c0')

    # Creating nodes in the network.
    h0 = net.addHost('h0')
    s0 = net.addSwitch('s0')
    h1 = net.addHost('h1')
    s1 = net.addSwitch('s1')

    # Creating links between nodes in network.
    h0int, s0int = createLink(h0, s0)
    h1int, s1int = createLink(h1, s1)
    s0pint, s1pint = createLink(s0, s1)

    # Configuration of IP addresses in interfaces
    s0.setIP(s0int, '192.168.1.1', 26)
    h0.setIP(h0int, '192.168.1.2', 26)
    s1.setIP(s1int, '192.168.1.65', 26)
    h1.setIP(h1int, '192.168.1.66', 26)
    s0.setIP(s0pint, '192.168.1.129', 26)
    s1.setIP(s1pint, '192.168.1.130', 26)

    # start stuff and present CLI
    net.start()
    CLI(net)
    net.stop()

Complete script I used with debugging information can be found here:
https://github.com/hip2b2/poxstuff/blob/master/of_router_topo.py

I get the following output:

*** Creating network for Static Router Example
*** Network state:
s0: IP=192.168.1.129 intfs=s0-eth1,s0-eth2 pid=2534
s1: IP=192.168.1.130 intfs=s1-eth1,s1-eth2 pid=2536
h0: IP=192.168.1.2 intfs=h0-eth0 pid=2533
h1: IP=192.168.1.66 intfs=h1-eth0 pid=2535
*** Configuring hosts
h0 h1 
*** Starting controller
*** Starting 2 switches
s0 s1 
*** Starting CLI:

Here are the ifconfig output:

s0-eth1   Link encap:Ethernet  HWaddr 8e:70:01:30:64:4b  
          inet addr:192.168.1.1  Bcast:192.168.1.63
Mask:255.255.255.192
          inet6 addr: fe80::8c70:1ff:fe30:644b/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:6 errors:0 dropped:0 overruns:0 frame:0
          TX packets:15 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:468 (468.0 B)  TX bytes:1146 (1.1 KB)

s0-eth2   Link encap:Ethernet  HWaddr 3e:e1:15:ce:7b:e2  
          inet addr:192.168.1.129  Bcast:192.168.1.191
Mask:255.255.255.192
          inet6 addr: fe80::3ce1:15ff:fece:7be2/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:768 (768.0 B)  TX bytes:768 (768.0 B)

s1-eth1   Link encap:Ethernet  HWaddr 5a:74:03:22:2a:52  
          inet addr:192.168.1.65  Bcast:192.168.1.127
Mask:255.255.255.192
          inet6 addr: fe80::5874:3ff:fe22:2a52/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:6 errors:0 dropped:0 overruns:0 frame:0
          TX packets:13 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:468 (468.0 B)  TX bytes:978 (978.0 B)

s1-eth2   Link encap:Ethernet  HWaddr 36:dc:d8:a3:95:a0  
          inet addr:192.168.1.130  Bcast:192.168.1.191
Mask:255.255.255.192
          inet6 addr: fe80::34dc:d8ff:fea3:95a0/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:10 errors:0 dropped:0 overruns:0 frame:0
          TX packets:10 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:768 (768.0 B)  TX bytes:768 (768.0 B)

h0-eth0   Link encap:Ethernet  HWaddr 52:bb:01:98:23:36  
          inet addr:192.168.1.2  Bcast:192.168.1.63
Mask:255.255.255.192
          inet6 addr: fe80::50bb:1ff:fe98:2336/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:15 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:1146 (1.1 KB)  TX bytes:468 (468.0 B)

h1-eth0   Link encap:Ethernet  HWaddr d6:8c:bf:f2:fb:f6  
          inet addr:192.168.1.66  Bcast:192.168.1.127
Mask:255.255.255.192
          inet6 addr: fe80::d48c:bfff:fef2:fbf6/64 Scope:Link
          UP BROADCAST RUNNING MULTICAST  MTU:1500  Metric:1
          RX packets:13 errors:0 dropped:0 overruns:0 frame:0
          TX packets:6 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000 
          RX bytes:978 (978.0 B)  TX bytes:468 (468.0 B)

I have two (2) hosts and two (2) switches/routers. I have given IP
addresses for each. There are three (3) networks here between s0 and h0,
s1 and h1, s0 and s1 (defined by the createLinks). 

The switch I am using is the IdealPair switch in
of_switch_tutorial_resend.py.

After running this script, I should NOT be able to ping h0 and h1 but I
can. I cannot however ping the s0 and s1 switches. 

Any help would be appreciated. Thank you.
-- 
-------------------------------------------------------
William Emmanuel S. Yu, Ph.D. (杨怀义)
Department of Information Systems and Computer Science
Ateneo de Manila University
email  :  wyu at ateneo dot edu
blog   :  http://hip2b2.yutivo.org/
web    :  http://CNG.ateneo.edu/cng/wyu/
phone  :  +63(2)4266001 loc. 4186
GPG    :  http://CNG.ateneo.net/cng/wyu/wyy.pgp

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