Thank you for posting in Intel Ethernet Communities.
Base on your inquiry, we have specific forum for these issues and I will be transferring this thread for faster response.
Intel Customer Support Technicians
A Contingent Worker at Intel
Since you are running linux on board, you can use some linux commands to control the ethernet stream. I would start with tcpdump. If you cannot find tcpdump command, you might need to install it:
opkg install tcpdump
More information about this command can be found here:
Hope this might help.