MTU is the maximum Ethernet v2 packet size (1500); MSS is the "payload" it can carry (1460). If you see 1492 for your MTU, you are maybe using Point to Point Pr

MTU is the maximum Ethernet v2 packet size (1500); MSS is the "payload" it can carry (1460). If you see 1492 for your MTU, you are maybe using Point to Point Protocol over Ethernet (PPPoE) which chomps another 8 bytes.