VMware ESXi Network Connectivity Troubleshooting Checklist

!Issue

Troubleshoot ESXi management and VMkernel connectivity by checking VLANs, routes, MTU, vmnics, port groups and physical switch paths.

✓Solution

01 Identify the failing path

★Recommendations

06 Validate end to end Repeat the original operation after one controlled correction and record the before-and-after result.

Separate management, vMotion, storage and VM traffic. Test the specific VMkernel interface instead of relying only on a host ping.

Identify the failing path

Review IP address, subnet mask, gateway, enabled services and VLAN assignment. Compare the affected host with a known-good host.

Verify vmnic link state, switch ports, speed and duplex. A link that appears up can still have VLAN or switch configuration problems.

Use vmkping with the required packet size when jumbo frames are configured. An MTU mismatch can cause intermittent or protocol-specific failures.

Confirm the route to the destination and that required ports are permitted. Test the actual service path such as vCenter, vMotion or storage.

Repeat the original operation after one controlled correction and record the before-and-after result.

Continue with practical infrastructure troubleshooting, PowerShell scripts and operational runbooks.