Understanding the Ethernet Protocol: A Guide to Ethernet II and ARP Requests

Wireshark Installation: Understanding the Ethernet Protocol

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• For installation, just proceed with the default settings; you only need to change the installation path at one point.

Ethernet Protocol Frame Format Analysis in Wireshark

Data Link Layer

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Ethernet II | Ethernet Protocol Version II

• | – |Source: IntelCor49:30:59 (Manufacturer’s Serial) (38:ba:f8:49:30:59) (MAC Address) | Source AddressDestination: TaicangT3d:9b:a8 (Manufacturer’s Serial) (6c:c6:3b:3d:9b:a8) (MAC Address) | Destination AddressType: IPv4 (0x0800) | Protocol Type

Network Layer

Src: 192.168.1.5 | Source Address

• | – |Dst: 203.119.247.189 | Destination AddressVersion: 4 | Internet Protocol IPv4Header Length: 20 bytes (5) | IP Header LengthDifferentiated Services Field: 0x00 (DSCP: CS0, ECN: Not-ECT) | Differentiated Services FieldTotal Length: 41 | Total Length of IP PacketIdentification: 0x3e8f (16015) | Identification FieldFlags: 0x4000, Don’t fragment | Flags (whether this IP packet allows fragmentation during routing)Fragment offset: 0 | Fragment Offset (identifier for this fragment if an IP packet is fragmented during transmission)Time to live: 128 | Time To Live TTLProtocol: TCP (6) | Upper Layer ProtocolHeader checksum: 0x0000 validation disabled | Header ChecksumHeader checksum status: Unverified | Header Checksum StatusSource: 192.168.1.5 | Source IP AddressDestination: 203.119.247.189 | Destination IP Address ARP captures an ARP protocol process, explaining the corresponding values

ARP Request Packet

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Address Resolution Protocol (request)

Hardware type: Ethernet (1) | Hardware Type

• | – |Protocol type: IPv4 (0x0800) | Protocol TypeHardware size: 6 | Hardware LengthProtocol size: 4 | Protocol LengthOpcode: request (1) | OperationSender MAC address: TaicangT_3d:9b:a8 (6c:c6:3b:3d:9b:a8) | Sender MACSender IP address: 192.168.1.1 | Sender IPTarget MAC address: 00:00:00_00:00:00 (00:00:00:00:00:00) | Target MACTarget IP address: 192.168.1.4 | Target IP

ARP Reply Packet

Address Resolution Protocol (reply)

Hardware type: Ethernet (1) | Hardware Type

• | – |Protocol type: IPv4 (0x0800) | Protocol TypeHardware size: 6 | Hardware LengthProtocol size: 4 | Protocol LengthOpcode: reply (2) | OperationSender MAC address: IntelCor_49:30:59 (38:ba:f8:49:30:59) | Sender MACSender IP address: 192.168.1.5 | Sender IPTarget MAC address: TaicangT_3d:9b:a8 (6c:c6:3b:3d:9b:a8) | Target MACTarget IP address: 192.168.1.1 | Target IP

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