[pox-dev] Change IP address in arp

[Murphy McCauley]

I'm still missing a lot of details.

Are the IPs all in the same subnet?

The IPs change on the host.  Both at the same time?  At the controller, how do you know that the change has happened?

It might help if I understood why this was going on.  A pcap trace might also help, though the time I personally have available to look is limited until the end of the week.

-- Murphy

On Jul 16, 2013, at 1:14 AM, Silvia Fichera wrote:

> I can explain it better.
> I have my network. Host h1 send a ping to h2. While they're communicating their ip address changes. All new ip assigned are in a list so i can check if they are valid or not.
> 
> At the beginning it catches the if condition:
> 
> if prt==inport
> 
> but i've added another condition (check if the new dstip is a valid ip from the list of all new ip) and i've duplicated the code of installing flows  addind the function I've already posted to change ip in the packet. 
> If I check dstaddr and srcadd I have new addresses but if I monitor traffic with wireshak I see packet from h1 new ip to h2 hold ip.
> Controller messages about arp tell me the same thing. In a first moment the controller does the arp between the two new addresses, than it does it between new source ip and old destination ip.
> I've noticed in wireshark is in the interface of host h2 that when i change ip addresses there is a particular ICMP packet with the information of redirecting.
> So, h1 continues to send packets but it does not recive answers anymore.
> Maybe it's just something related to ICMP...
> There is a way to uderstand what really happen?
> 
> Thanks
> 
> 
> 
> 
> 2013/7/16 Murphy McCauley <murphy.mccauley at gmail.com>
> I'm not sure I understand what you're doing here.  But if you have an ARP packet object at the controller, you can just change the IP addresses before sending it (if I recall correctly, ARPs in l3_learning are *always* sent to the controller).
> 
> Hope that helps.  If not, maybe you can explain further exactly what you're doing/trying to do.
> 
> -- Murphy
> 
> On Jul 15, 2013, at 8:01 AM, Silvia Fichera wrote:
> 
> > Hi all,
> > I'm using l3_learning. I've created a fuction to change randomly hosts's ip addresses. I've insert the action to change the dstip but, if I start a ping and than chenge the IP it is locked in arp because it look for old destination ip address. Ho to set new destination also in the arp packet?
> >
> > Thanks
> >
> > --
> > Silvia Fichera
> 
> 
> 
> 
> -- 
> Silvia Fichera

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