I am not really sure you can do it for a VMNIC because I think it's possible to do only for VMKernel interfaces. But try with tcpdump-uw in the shell access (or SSH session) and export capture packets in a file (by following command) and open it in a tools like Wireshark. Maybe you can find something related. (I can't remind a syntax of tcpdump about capturing errors, discards or bad packets.)
# tcpdump-uw -i vmk0 -w /var/tmp/export.pcap