PPTP/L2TP over PPPoE的準確MTU/MRU值
1 Ethernet MinSize = 512bit = 64 Byte 2Ethernet MaxSize = 1518 Byte 3so Ethernet IP MTU = 1518 - 18 ( 6 SRCMAC+ 6 DSTMAC+ 2 TYPE+ 4 CRC) = 1500 B 4so Ethernet IP TCP MSS = 1500 - 40 ( 20 IP_HEADER + 20 TCP_HEADER) = 1460 B 5so Ethernet IP UDP MTU/MRU = 1500 - 28 ( 20 IP_HEADER + 8...