MTU/MSS - How to test using PING

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MTU = max transmission unit of a Layer 2 Frame
MSS = max segment size of a Layer 4 protocol

For TCP/IP:
MSS = MTU-40 (TCP and IP headers are 40 bytes)
ping -f -l X (set do not fragment and set icmp payload to X)

If X = 1388 gets a reponse then
MTU = X + 28 (for ICMP and IP header)
MTU = 1416

MSS = 1416 - 40 = 1376

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