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USB Capture Of Ethernet Traffic Using Sharktap

I'm new to wireshark and sharktap so please forgive if this is a silly question or has been previously answered. I'm trying to capture Ethernet data between a HMI screen and a PLC using a Sharktap USB but have to send the data through a usb converter as my computer doesn't have an Ethernet port. The IP addresses of the HMI and PLC aren't showing up but rather I'm getting new IP addresses assigned by the host. Is there any way to see the original IP addresses so that I can more easily analyze the traffic? Thanks in advance for any help.