To verify MTU and connectivity between VTEPs, use vmkping from an ESXi host console session. VTEP VMkernel is provisioned in a dedicated TCP/IP stack name, vxlan. To specify a TCP/IP stack on a vmkping, you can use either of the following formats:
vmkping ++netstack=vxlan <destination VTEP IP address> -d -s <packet size>
Or:
vmkping -S vxlan <destination VTEP IP address> -d -s <packet size>
The following are the command arguments:
- -d: Sets the DF (do not fragment) bit on IPv4 packets
- -S or ++netstack=: TCP/IP stack
- -s <packet size>: Sets the number of ICMP data bytes
- -I: Outgoing VMkernel interface
Ping the VTEP VMkernel using the packet size 1572 and the packet size 1472. If there is an MTU mismatch on vDS ...