Hi Suresh,
from the ssh terminal on the ESXi host = 10.1.1.40:
~ # vmkping -d -s 8500 10.1.1.5
PING 10.1.1.5(10.1.1.5): 8500 data bytes
sendto() failed (Message too long)
sendto() failed (Message too long)
sendto() failed (Message too long)
--- 10.1.1.5ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss
~ # vmkping -d -s 9000 10.1.1.5
PING 10.1.1.5(10.1.1.5): 9000 data bytes
sendto() failed (Message too long)
sendto() failed (Message too long)
sendto() failed (Message too long)
--- 10.1.1.5ping statistics ---
3 packets transmitted, 0 packets received, 100% packet loss