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IPv4 Header

BYTE 1 BYTE 2 BYTE 3 BYTE 4
Version / IHL (Header Length) Type of Service Total Length
Identification IP Flags / Fragment Offset
Time To Live Protocol Header Checksum
Source Address
Destination Address
IP Option (variable length, optional)

Protocol

1 ICMP, Internet Control Message Protocol
2 IGMP, Internet Group Message Protocol
6 TCP, Transport Control Protocol
17 UDP, User Datagram Protocol

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