hi,
I am trying to re-write IP header in pyswitch using the following code
below
/* obtain ip header and packet for the incoming packet*.
if packet.type == ethernet.IP_TYPE:
iph = packet.find('ipv4')
/* if there is a incoming packet in port 1, rewrite the header to have
destination ip address to "X.X.X.X" */
if(inport ==1 ):
iph.dstip = convert_to_ipaddr("X.X.X.X")
replypkt =ethernet()
replypkt.set_payload(iph)
replypkt.type = ethernet.IP_TYPE
replypkt.src = octstr_to_array("00:00:00:00:00:0b")
replypkt.dst = octstr_to_array("00:00:00:00:00:0d")
outport=3
inst.send_openflow_packet(dpid,replypkt.tostring(),outport)
print "Information in the outgoing packet"
ip_packet = replypkt.find('ipv4')
print ip_packet
print ip_packet.srcip
print ip_packet.dstip
I extract the ip, change the dstip in ip header to X.X.X.X. A ethernet
packet is created which will carry this IP in its payload.
I try to perform a simple TCP connection.
Using wireshark I am able to see a TCP syn packet arriving at port 3. A
host whose IP is X.X.X.X attached to port 3 with ethernet address
"00:00:00:00:00:0d" is also able to receive it. I am able to observe this
using tcpdump. But the host on port 3 is not generating a syn +ack packet
in response to this syn. Am I missing something?
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