Objective 10.5 – Troubleshoot common vSphere network issues


  1. Verify network configuration
  2. Verify a given virtual machine is configured with the correct network resources
  3. Troubleshoot virtual switch and port group configuration issues
  4. Troubleshoot physical network adapter configuration issues
  5. Determine the root cause of a network issue based on troubleshooting information


  1. vSphere Networking Guide


  1. vSphere Command Line Interface Concepts and Examples


  1. vSphere Troubleshooting Guide


Verify network configuration

  • Verify physical network has MTU >= 1600
  • Check correct (and common) teaming policy is applied NSX enabled vDS:
    • “Route Based on Originating Port” is recommended unless a vPC/MLAG is configured
    • “Route based in IP Hash (Static Etherchannel)” is recommended for vPC uplinks
  • Check VXLAN connectivity: vmkping ++netstack=vxlan -d -s <packet size> <vmknic IP> (set packet size >= 1572)
  • If using hybrid mode, ensure an IGMP Querier is configured on the Transport Network
  • Check all hosts resolve in DNS
  • List vmk interfaces on a host: esxcli network ip interface ipv4 get
  • Get vmk interface details: esxcli network ip interface list