I was with a GSS Support today troubleshooting NSX issue on one of my engagement. He did a packet trace from ESXi hosts to see if there is traffic leaving/ entering the physical NIC which really nice. This will be helpful in establishing if the issue is somewhere in the environment or not.
Here’s the command
pktcap-uw –uplink vmnic0 –capture UplinkRcvKernel -o -| tcpdump-uw -nr –
pktcap-uw –uplink vmnic0 –capture UplinkSndKernel -o -| tcpdump-uw -nr –
You can grep the result as you see fit.