Tcpdump only shows inbound packets

Hi there! I have a Microuter USB150 which I absolutely love. I’m trying to troubleshoot a network problem, so I installed tcpdump on the device. However, it only appears to be capturing inbound packets. Has anyone run into this issue before?

Grab the data packet needs to be in different network ports, and the stacking and popping are different. You can grab the data of other network ports and try it.