What command is used to check VMware kernel ports for tunnel endpoint communication after a ping test failure?

The correct command to check VMware kernel ports for tunnel endpoint communication after a ping test failure is indeed associated with the use of the vmkping utility, specifically with the ++netstack=vxlan-d option. This command is relevant in scenarios where VXLAN (Virtual Extensible LAN) overlays are being utilized within the VMware environment.

Using vmkping with the specified options helps to test connectivity specifically for VXLAN tunnels, which are often employed in network virtualization solutions such as VMware NSX. By specifying ++netstack=vxlan-d, it tells the system to use the VXLAN data stack, enhancing the reliability of the test by ensuring that the packet's encapsulation and path through the tunnel can be properly verified.

The parameters -s 1572 indicate the size of the packets to be sent, which is critical for accurately testing MTU (Maximum Transmission Unit) size for tunnel communication. Testing with the correct MTU size is essential because tunnel encapsulation adds overhead, and if the MTU is too large for the path, packets may get dropped, leading to connectivity issues.

In summary, using this command allows administrators to directly check for tunnel endpoint communication under expected usage conditions, emphasizing the importance of