[pox-dev] Fwd: Routing Table

[Windhya Rankothge]

I am sorry to trouble you again..

I created my topology in mininet with POX as the remote controller..

Then I issued following command on mininet
mininet> s1 ovs-ofctl show tcp:127.0.0.1:6633

Then I get the following error in POX terminal

ERROR:openflow.of_01:[None 4]: Exception while handling OpenFlow message:
[None 4] ofp_features_request
[None 4]   header:
[None 4]     version: 1
[None 4]     type:    5 (OFPT_FEATURES_REQUEST)
[None 4]     length:  8
[None 4]     xid:     1
Traceback (most recent call last):
  File "/home/u99319/pox/pox/openflow/of_01.py", line 749, in read
    h(self, msg)
TypeError: 'NoneType' object is not callable

Please be kind enough to help me with this.. Where I am going wrong ?





On Thu, May 30, 2013 at 10:31 AM, Murphy McCauley <murphy.mccauley at gmail.com
> wrote:

> The interfaces on s0 and s1 that connect to the other nodes in your
> topology are part of an Open vSwitch datapath.  Thus, packets on them do
> not go through the normal Linux networking stack and do not have
> corresponding entries in the Linux routing table.  Instead, they are
> processed by OVS's tables.  You can view these with the OVS tools, e.g.,
> ovs-ofctl.
>
> If you want to check the path of a packet, you can also pay attention to
> which table entries POX actually sends to the switches...
>
> -- Murphy
>
> On May 29, 2013, at 11:42 PM, hansinie vitharana wrote:
>
> > Hi,
> > I am very new to POX and mininet and I have a small question about
> routing tables
> > I create following topology
> > h1 --- s0 ----- s1 --- h2
> >
> > h1 = net.addHost('h1',ip='10.1.0.1')
> > h2 = net.addHost('h2',ip='11.1.0.2')
> > So h1 and h2 are in two different subnets..
> > I run the mininet script with POX contoller and I am using l2_learning
> in POX controller.
> > Then I give following commands in mininet, so i can have connectivity
> between subnets
> >
> > mininet> h1 route add -net default h1-eth0
> > mininet> h2 route add -net default h2-eth0
> > when I ping from h1 to h2, its sucessful
> >
> > when I look at the routing table of h1
> >
> > mininet> h1 route
> > Kernel IP routing table
> > Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> > default         *               0.0.0.0         U     0      0        0
> h1-eth0
> > 10.0.0.0        *               255.0.0.0       U     0      0        0
> h1-eth0
> >
> > when I look at the routing table of switch s0
> >
> > mininet> s0 route
> > Kernel IP routing table
> > Destination     Gateway         Genmask         Flags Metric Ref    Use
> Iface
> > default         10.80.7.245     0.0.0.0         UG    0      0        0
> eth0
> > 10.80.4.0       *               255.255.252.0   U     1      0        0
> eth0
> > link-local      *               255.255.0.0     U     1000   0        0
> eth0
> > As far as I know when h1 ping to h2, S0 switch should learn about the
> new network and its routing table should include information about 11.0.0.0
> network..
> > But even after ping, there is no entry for 11.0.0.0 in S0
> > Am I missing something here ? Whats wrong with the routing table ?
> > I want to check the path of the packet and thats why I am looking at the
> routing tables.. Is there any other way to check the path of the packets ?
>
>


-- 
Best Regards,

Windhya Rankothge..... (WINDY)
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