If you can using openvswitch, you can write a rule something like this:
ovs-ofctl add-flow s1 in_port=1,tcp, tcp_flags=+syn, actions=output:2
This can be done via RYU application by inserting a rule using flow_mod.
1. Parse the packet
2. Get the tcp header and get the tcp flags, and get their respective
bits ( see ryu api).
3. Insert a rule through flow_mod command.
Hope this helps.
On Thu, Apr 28, 2016 at 5:08 PM, Randa Alani <[email protected]> wrote:
> Dear all
>
> How to modify TCP ACK packet received by an Openflow switch which is
> controlled by Ryu controller? What match field can be used?
>
>
>
> I intend to count the number of flows passing through a switch depending
> on SYN/FIN flag and insert this count in the ACK packet? How to do that?
>
>
>
> Any information would be very helpful.
>
>
>
> Kind regards
>
> randa
>
>
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