Internet Protocol; Ip Datagram - Panasonic DP-8020E Service Manual

9.3.3.

Internet Protocol

The IP (Internet Protocol) operating at the OSI Network layer, is a connectionless protocol that provides
datagram service, and IP packets are most commonly referred to as IP data grams.
It performs the following typical functions:
1. Identifies the IP address
2. Packet disassembly and reassembly of the IP datagram
3. Routing of the IP address
Internet
Version
Header Length
Time To Live
Terms
Version
Internet Header
Length
Type Of Service
ID
Flags
Fragment Offset
Time To Live
Protocol
Header Checksum
Source Address
Destination Address
Option
Padding
Ver. 1.0
Type Of Service
ID
Protocol
Source Address
Destination Address
Option + Padding (size varies)

IP Datagram

Currently version 4
IP Header field length
Service priority requested by IP Datagram (3 bits are reserved for
precedence)
Identification frame number for upper layer communication
Packet disassembly information
Offset from most significant bit
Decrement the counter until 0 every time packet pass over the router
Upper layer protocol identification number. ie TCP (06h), UDP (11h)
Checksum is used for error checking on the header data
Sender's IP Address
Destination's IP Address
When implemented
Fill bit field to add up to 32 bit
4 byte
Total Length
Flags
Header Checksum
Data
Detail
429
DP-8020E/8020P/8016P
Fragment Offset
SEP 2006