I will try to explain to you what I am trying to do with a different example. Let's say that we have the topology below[image: Ενσωματωμένη εικόνα 1]
Let's say that I choose to ping from host .2 to the host .5. For some reason (possibly due to traffic or something else) I choose to instruct the package to follow the path : 192.16.3.2 --> 192.168.3.1 --> 192.168.3.6 --> 192.168.3.5 and not the path 3.2 --> 3.1 --> 3.3 --> 3.4 --> 3.5. First of all I suppose that I have to find the MAC addresses which are associated with the IPs of each host. Probably, this can be done with l3_learning.py code. The big question is how can I add manually the exact path that the ping package should follow according to my criteria. In the future, I will have to check the traffic between the nodes *and then*decide the path that should be followed. But for now, it's enough to begin with the determination of the path in the code. Thanks for your help Alexandros 2013/4/11 Murphy McCauley <murphy.mccau...@gmail.com> > It's not entirely clear to me what you're trying to accomplish here. Is > it that when you get a packet to any of the .2/.3./.4, you want to > duplicate it and send it to the other two also? If so, I think this is > just three rules, one which matches on each address. The actions for these > are two rewrites and two outputs. You know the IP address you want to > rewrite to, but you'll also need to figure out the MAC address which goes > with the IP address, and you'll need to figure out which port to send on. > The former is the job of ARP (though you could also potentially just learn > it), and the latter is basic learning behavior. You could implement these > in the controller (the l3_learning component does this), but it may also be > possible to get some help from the OFPP_NORMAL virtual output port. > > -- Murphy > > On Apr 10, 2013, at 8:53 AM, Kouvakas Alexandros wrote: > > Hello again, > I want to install some flows manually to the OF switch. I have an overlay > network with a subnet 192.168.3.1/24. The central node with the OVS is > the one with the IP 192.168.3.1 and there are 3 hosts connected directly to > the central. It's more or less like the Openflow tutorial with mininet. > > What I want to do, is when the OF switch receives a packet, let's say from > the node 192.168.3.2, to forward it to the nodes for example 192.168.3.4 > and 192.168.3.3. I would like to use the IPs of the nodes and not the MAC > addresses or ports. In this kind of topology there is not any real > usefulness, but in the future I am planning to have a more complicated > overlay network with many nodes connected to each other. In the latter case > I will try to direct the packet through a path that I will choose. > > Is there any example of how I can do that? Do you think it is better to > alter the code of l2_learning.py or start from the scratch? > > > 2013/3/29 Murphy McCauley <murphy.mccau...@gmail.com> > >> On Mar 29, 2013, at 3:28 AM, Felician Nemeth wrote: >> >> >>> My node has python version 2.6.2. >> >> >> >> Note that you may run into some problems here -- POX's requirement is >> Python 2.7. >> > >> > I'd like to mention that it is sometimes not straightforward to install >> > a new python version. In which case, pythonbrew is really useful. >> > >> > https://github.com/utahta/pythonbrew >> >> This is a good tip, so I added it to the manual. Thanks. >> >> Between pythonbrew, PyPy, and the recent patches, I think the world for >> 2.6-ers is decent. The manual could probably be refactored a bit to put >> all the Python-version stuff in one place, but that's a project for another >> time or person. :) >> >> It sure would have been nice if 2.6 had been phased out before Python 3 >> really started getting deployed, but it's looking like that's not going to >> happen. Oh well. :) >> >> -- Murphy > > > > > -- > Kouvakas Alexandros > > > -- Kouvakas Alexandros
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