MTU Size

• 一般MTU Size (即Packet Size) 是 1500 bytes
• 1500 bytes Packet 內的 TCP [mtu = 1500]
  • IP 20 bytes Header
  • TCP 20 bytes Header
  • MSS 1460 bytes Encapsulated Data
• 1472 bytes Packet 內的 TCP with Cloud or some specific protocols [mtu = 1472]
  • IP 20 bytes Header
  • TCP 20 bytes Header
  • MSS 1432 bytes Encapsulated Data
• 1500 bytes Packet [mtu = 1500]
  • PPP: 1492 bytes + 8 bytes PPP header
  • GRE: 1400 bytes + 100 bytes IPsec/GRE header
• Frame [mtu = 1500]
  • 18 bytes Frame header
  • 1500 bytes payload
• Dot1x [mtu = 1500]
  • 4 bytes tag
  • 18 bytes Frame header
  • 1500 bytes payload