Hi,
Following is the code for ARP Reply.
logger = logging.getLogger('nox.coreapps.examples.pyswitch')
# Global pyswitch instance
inst = None
# Timeout for cached MAC entries
CACHE_TIMEOUT = 1000
# --
# Given a ARP Request, Send ARP Response
# --
def send_arp_reply(dp, packet, inport):
# Grab the arp hdrs of the rcvd pkt
reqh = packet.find('arp')
logger.debug("send arp reply")
# Create the arp packet and fill in the info
replyh = arp()
replyh.hwsrc = mac_to_int('\x44\x87\xfc\x4e\x67\x69')
replyh.hwdst = reqh.hwsrc
replyh.hwlen = reqh.hwlen
replyh.opcode = arp.REPLY
replyh.protolen = reqh.protolen
replyh.protosrc = strToIp("192.168.0.100")
replyh.protodst = reqh.protosrc
replyh.prototype = arp.PROTO_TYPE_IP
# Create the ethernet packet, fill in the info and set as payload the arp
# packet
replypkt = ethernet()
replypkt.set_payload(replyh)
replypkt.type = ethernet.ARP_TYPE
replypkt.src = mac_to_int('\x44\x87\xfc\x4e\x67\x69')
replypkt.dst = packet.src
logger.debug("arp pkt %s" % str(replypkt))
# Send the arp reply out the same switch that recvd the request and out the
# port from which the REQUEST was rcvd
inst.send_openflow_packet(dp, replypkt.__str__(), inport)
print "ARP Reply sent..."
# --
# Given a packet, learn the source and peg to a switch/inport
# --
def do_l2_learning(dpid, inport, packet):
global inst
# Check whether ARP REQUEST or not
if packet.type == ethernet.ARP_TYPE:
arph = packet.find('arp')
print "ARP Packet source is", (ipToStr(arph.protosrc) == "192.168.0.56")
print "ARP Packet destination is", (ipToStr(arph.protodst) ==
"192.168.0.50")
# packet drop
# Generate ARP Response with destination MAC of controller
if(arph.opcode == arp.REQUEST and ipToStr(arph.protodst) ==
"192.168.0.50"):
send_arp_reply(dpid, packet, inport)
# learn MAC on incoming port
srcaddr = packet.src.tostring()
if ord(srcaddr[0]) & 1:
return
if inst.st[dpid].has_key(srcaddr):
dst = inst.st[dpid][srcaddr]
if dst[0] != inport:
log.msg('MAC has moved from '+str(dst)+'to'+str(inport),
system='pyswitch')
else:
return
else:
log.msg('learned MAC '+mac_to_str(packet.src)+' on %d %d'%
(dpid,inport), system="pyswitch")
# learn or update timestamp of entry
inst.st[dpid][srcaddr] = (inport, time(), packet)
# Replace any old entry for (switch,mac).
mac = mac_to_int(packet.src)
From: Kyriakos Zarifis [mailto:kyr.zari...@gmail.com]
Sent: Tuesday, November 15, 2011 12:23 AM
To: Harshil Anil Kumar Shah
Cc: nox-dev@noxrepo.org
Subject: Re: [nox-dev] Not able to send ARP Reply
Hello,
How exactly did you figure out that the ARP is not received? Id try the
following troubleshooting steps to see where the problem is:
Did you try to use wireshark to see how far you ARP packet goes?
Is it actually sent out the controller interface? (it probably is)
Is it being received on the switch interface? (this might not be true,
depending on how you constructed the ARP)
If yes, is it properly formed? Can the switch process it and install an arp
entry from it?
(you could also paste the code where you construct/send the ARP)
On Mon, Nov 14, 2011 at 5:05 AM, Harshil Anil Kumar Shah
<harshil_s...@infosys.com<mailto:harshil_s...@infosys.com>> wrote:
Hi,
Currently, I am trying to send ARP Reply to my openflow switch from NOX-0.8. In
the debug message it shows that ARP Reply is sent and also shows the packet
information. But I am not able to receive it on my openflow switch. What can be
the solution?
Thanks in advance.
Regards,
Harshil Shah,
Convergence Lab, Infosys Labs
Infosys | Bangalore
Mob # : +91 97428 87966<tel:%2B91%2097428%2087966>.
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