Marking UDP Data Packets using OpenVSwitch

[Daniel Joyner]

Can anyone offer any advice or know of a tutorial for; Marking UDP data packets using OpenVSwitch and then dropping the marked packets using Vswitch as well. 

[Niky Riga]

Hi Daniel,

It depends on what do you mean by marking UDP packets. If you just want
to modify a specific piece of header so that you can recognize these
packets in your network then yes you can do that as long as you find the
appropriate field to modify.

You should read the OpenFlow 1.0 spec[1] to identify which field you
would like to use for this. If your network is all layer 2 IP TOS might
be a good option for this.

Later you can indeed have a rule that will drop such marked packets, if
I remember correctly drop is usually an output action with an empty list
of ports.

We don't have a tutorial that does exactly that, but our Intro to
OpenFlow tutorial has example of controllers of how to match on specific
fields and how to rewrite other parts of the packets (IP address,
transport ports):

http://groups.geni.net/geni/wiki/GENIExperimenter/Tutorials/OpenFlowOVS

Good luck,
Niky

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