To create ARP as a raw stream we do have an ARP header so just delete the default IPv4 header and add the ARP header.
As for the capture, you will see in the GUI showing information about the Capture Source. Capturing transmitted packets are only for control plane. Data traffic can only be captured on the receive side. Note that transmission of a stream blocks is considered data traffic, no matter how you configure it. So if you want to capture this raw stream block you created, it can only be done if received.
If you want to verify what you created, you can put the TestCenter port into diagnostic loopback and then you will be able to capture it since it is now being also received on that port.
Once you verify it is good, you can put the port back to normal mode.
After placing back to normal mode any captures on that port will only show the responses.
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