MTU Calculation

ping <ipaddress> size=1600 do-not-fragment

Jika do-not-fragment diatur paket tidak akan terpecah-pecah jika ukuran melebihi antarmuka mtu .

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Ethernet MinSize = 512bit = 64 Byte
Ethernet MaxSize = 1518 Byte
Ethernet IP MTU = 1518 – 18 ( 6 SRCMAC+ 6 DSTMAC+ 2 TYPE+ 4 CRC) = 1500 Byte
Ethernet IP TCP MSS = 1500 – 40 ( 20 IP_HEADER + 20 TCP_HEADER) = 1460 Byte
Ethernet IP UDP MTU/MRU = 1500 – 28 ( 20 IP_HEADER + 8 UDP_HEADER ) = 1472 Byte
PPPoE MTU/MRU = 1500 – 8 ( 6 PPPoE_SESSION + 2 PPP_HEADER ) = 1492 Byte
TCP over PPPoE MSS = 1492 ( PPPoE MTU/MRU ) – 40 ( 20 IP_HEADER + 20 TCP_HEADER) = 1452 Byte
PPTP MTU/MRU = 1500 – 56 ( 20 IP_HEADER + 20 TCP_HEADER + 12 GRE_HEADER + 4 PPP_HEADER ) = 1444 Byte
TCP over PPTP MSS = 1444 ( PPTP MTU/MRU ) – 40 ( 20 IP_HEADER + 20 TCP_HEADER) = 1404 Byte
L2TP MTU/MRU = 1500 – 40 ( 20 IP_HEADER +8 UDP_HEADER + 8 L2TP_HEADER + 4 PPP_HEADER ) = 1460 Byte
TCP over L2TP MSS = 1460 ( L2TP MTU/MRU ) – 40 ( 20 IP_HEADER + 20 TCP_HEADER) = 1420 Byte
PPTP over PPPoE MTU/MRU = 1492 ( PPPoE MTU/MRU ) – 56 ( 20 IP_HEADER + 20 TCP_HEADER + 12 GRE_HEADER + 4 PPP_HEADER ) = 1436 Byte
PPTP over PPTP MTU/MRU = 1444 ( PPTP MTU/MRU ) – 56 ( 20 IP_HEADER + 20 TCP_HEADER + 12 GRE_HEADER + 4 PPP_HEADER ) = 1388 Byte
PPTP over L2TP MTU/MRU = 1460 ( L2TP MTU/MRU ) – 56 ( 20 IP_HEADER + 20 TCP_HEADER + 12 GRE_HEADER + 4 PPP_HEADER ) = 1404 Byte
L2TP over PPPoE MTU/MRU = 1492 ( PPPoE MTU/MRU ) – 40 ( 20 IP_HEADER +8 UDP_HEADER + 8 L2TP_HEADER + 4 PPP_HEADER ) = 1452 Byte
L2TP over PPTP MTU/MRU = 1444 ( PPTP MTU/MRU ) – 40 ( 20 IP_HEADER +8 UDP_HEADER + 8 L2TP_HEADER + 4 PPP_HEADER ) = 1404 Byte
L2TP over L2TP MTU/MRU = 1460 ( L2TP MTU/MRU ) – 40 ( 20 IP_HEADER +8 UDP_HEADER + 8 L2TP_HEADER + 4 PPP_HEADER ) = 1420 Byte