I am a newbie to Openflow and I have been using the Openflow tutorial and the VM image that comes along to get myself started....and hence continued to use NOX
To monitor the OF traffic between the controller and switch I used Wireshary and the last OF traffic i saw was a OFP+ICMP Packet-In for H1--->H4 from Switch3 port to Controller Port.. For ARP requests sent from hosts to switches, I build an ARP reply to be sent to the host. I can see OFP+ARP packet-in and out in Wireshark. I did try to execute a ping on the same network topology H1 (10.0.1.2)---> H4(10.0.2.2) using the simple L3 switch in POX, however I could only see ARP requests from H1 to S2. I don't see the reply being sent. I am not sure where I am going wrong.. DEBUG:forwarding.l3_learning:2 1 flooding ARP request 10.0.1.2 => 10.0.1.1 DEBUG:forwarding.l3_learning:3 1 ARP request 10.0.1.2 => 10.0.1.1 DEBUG:forwarding.l3_learning:3 1 flooding ARP request 10.0.1.2 => 10.0.1.1 DEBUG:forwarding.l3_learning:2 1 ARP request 10.0.1.2 => 10.0.1.1 DEBUG:forwarding.l3_learning:2 1 flooding ARP request 10.0.1.2 => 10.0.1.1 DEBUG:forwarding.l3_learning:3 1 ARP request 10.0.1.2 => 10.0.1.1 DEBUG:forwarding.l3_learning:3 1 flooding ARP request 10.0.1.2 => 10.0.1.1 DEBUG:forwarding.l3_learning:2 1 ARP request 10.0.1.2 => 10.0.1.1 DEBUG:forwarding.l3_learning:2 1 flooding ARP request 10.0.1.2 => 10.0.1.1 DEBUG:forwarding.l3_learning:3 1 ARP request 10.0.1.2 => 10.0.1.1 DEBUG:forwarding.l3_learning:3 1 flooding ARP request 10.0.1.2 => 10.0.1.1 *- Rashmi* On Thu, Jul 19, 2012 at 4:55 PM, Murphy McCauley <[email protected]>wrote: > Do you have a good reason for using NOX-Classic? As we're no longer doing > any development with it, you might think about using POX (which already > contains a simple L3 switch). > > To more directly answer your question, you can use Wireshark to monitor > the OpenFlow traffic between the controller and the switch. The OpenFlow > reference implementation contains the OpenFlow dissector, and there's also > a github project for it. > > What are you doing about non-IP traffic? More to the point, what are you > doing about ARP? > > -- Murphy > > On Jul 19, 2012, at 4:46 PM, Rashmi Pujar wrote: > > > Hi, > > I am trying to implement a static L3 Switch using NOX in Python. I have > hardcoded the IPs and hence I do not perform any 'IP learning' as such. > > My network topology looks as below. > > > > Switch2<---------->Switch3 > > | | > > | | > > H1 H4 > > > > When Host1 tries to ping H4 i.e. an ICMP req to H4. The controller > ensures the destination mac address in this request is that of H4's; > installs a flow in Switch2 and forwards the packet to the next hop i.e. > Switch3. At Switch3 the arriving ICMP req has no flow entry and hence is > sent to controller. The controller again checks against its IP table and > installs a flow in Switch3 to finally forward the packet to the host at H4. > I can see in my logs that a flow entry is being made for action on an > appropriate port connecting to H4. However, I am expecting an ICMP echo > reply from H4 to complete the ping process and I do not see that > happenening...Is there a way to debug this, to actually see if an OF packet > has been sent to the host at H4? Am I expected to handle ICMP requests? > > > > It would be great if you could help. > > > > Thanks, > > Rashmi > > > >
