Hello Everyone,
I seem to be unable to form a correct ARP reply packet - whatever I do
the packet that is being sent out is malformed (as verified by
Wireshark), even though it is supposed to work since I got most/all of
the code from the NOX mailing list.
Here is the code. Any help will be greatly appreciated.
def ARP (self, dpid, inport, packet, buf, bufid):
arph = packet.find('arp')
original_eth = packet.find('ethernet')
if (arph.opcode == arp.REQUEST):
SOURCE_MAC_ADDR = "00:00:00:00:00:02"
arp_reply = arp()
arp_reply.hwtype = 1
arp_reply.hwlen = arph.hwlen
arp_reply.prototype = arp.PROTO_TYPE_IP
arp_reply.protolen = arph.protolen
arp_reply.opcode = arp.REPLY
arp_reply.hwsrc = octstr_to_array(SOURCE_MAC_ADDR)
arp_reply.hwdst = arph.hwsrc
arp_reply.protodst = arph.protosrc
arp_reply.protosrc = arph.protodst
eth = ethernet()
eth.set_payload(arp_reply)
eth.src = octstr_to_array(SOURCE_MAC_ADDR)
eth.dst = packet.src
eth.type = ethernet.ARP_TYPE
eth.hdr_len = ethernet.MIN_LEN
self.send_openflow_packet(dpid, eth.__str__(), inport)
else:
print "ARP response"
The packet that is being sent is almost twice the size of the ARP
request packet (128 vs. 230 bytes). Does anyone know what I am doing
wrong?
Thank you,
Vlad
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