Hi,
I want to change the destination address.
So I use these actions. And add output action.
OFPAT_SET_DL_DST, /* Ethernet destination address. */
OFPAT_SET_NW_DST, /* IP destination address. */
Finally destination node could receive the changed packet.
But there is a problem.
I snoop the packets using wireshark. After 3-handshaking (SYN, SYN+ACK),
the sender node send "RST" packet.
I think it is occured by reason of "I didn't update the IP checksum."
Openflow-spec describe below.
Action : Set IPv4 destination address
Description : Replace the existing IP destination address with and update
the IP checksum (and TCP/UDP/SCTP checksum if applicable).
This action is only applied to IPv4 packets.
But How can I update the IP checksum?
I use C/C++ languge. I try to find updating IP checksum problem in
nox-mailing list.
But I couldn't find it.
Is it a possible using "send_openflow_command()" fuction or
"send_openflow_packet()" fuction?
send_openflow_command() function = change original packet in switch using
flow action.
however, send_openflow_packet() = send new packet instructed by controller.
Could you give some advice or reference source?
Thank you.
- Hyogi
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