When running a tcpdump within ESX you may see only broadcast traffic this is due to your vSwitch not being in promiscuous mode. To resolve this do the following :
- Within the vShpere Client go to Configuration / Networking.
- Choose the virtual switch that your would like to capture the traffic on.
- On the virtual switch click Properties.
- Under the Ports Tab choose your vSwitch and select Edit.
- Within the Security Tab set Promiscuous mode to Accept.
Full details of enabling your vSwitch for tcpdump please see here.
Rick Donato is a Network Automation Architect/Evangelist and the founder of Packet Coders.
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