Wireshark analysis of TCP packets

Wireshark strictly follows the OSI model specification

• From top to bottom are the protocols used by the physical layer, data link layer, network layer and transport layer respectively

Take a look at the agreements

• Ethernet Ⅱ

  Layer 2 Ethernet frame format

MAC destination address

MAC source address

The ether type

• PPPoE

  PPPoE frame format

In the Wireshark, each item corresponds to a frame format

• PPP point-to-point protocol

  Point-to-point Protocol Indicates the PPP frame format

• IPv4

IPv4 Protocol Composition

Packets in the Wireshark

• TCP

  TCP protocol Composition

Packets in the Wireshark

• Data section