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STM32 初级课程-TCP-IP协议讲座2.pdf
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上传时间: 2019-09-13
详细说明：STM32 初级课程-TCP-IP协议讲座2Internet Protocol 3
IP characteristic
IP header
°| P Router
IP Packets Fragments
life. augmented
IP Characteristic
Best Effort Delivery(unreliable, connectionless
4
Packets can be lost
IP
Packets can be duplicated
Packets can be received in any order
The IP protocol can fragment and rebuild
127127127127
fragmented packets
‖IP
UPLICATE
UNORDERED
127.127127127
A12127127
IP
127127127127
Data
2127127
127.127.127.127
271
Data
life. augmented
Internet Protocol
IP Characteristic
IP Header
°| P Router
IP Packets Fragments
life. augmented
P Packet Header and data
Bit o
Bit 3 1
Version(4) Hdr len(4)
TOS(8)
Total Length in bytes( 16)
Identification(16 bits)
Flags (3
Fragment Offset(13)
o工
Time to Live( 8
Protocol(8)
Header Checksum (16)
Source P Address
Destination P Address
Options (if any
Data(variable length)
life. augmented
P Packet Header
Version
Version number of /P protocol(Version 4 or Version 6
Version(4) Hdr len (4)
TOS(8)
Total Length in bytes(16)
Identification(16 bits)
Flags(3)
Fragment offset(13)
Time to Live( 8)
Protocol ( 8)
Header Checksum(16)
Source P Address
Destination P Address
Options(if any)
life. augmented
IP Packet Header
8
Header Length (in 32 bit words)
Indicates end of header and beginning of payload
If no options, Header length=5 (5* 32bytes
Version(4) Hdr len(4)
TOS(8)
Total Length in bytes( 16)
Identification(16 bits)
Flags(3)
Fragment Offset(13)
Time to Live( 8)
Protocol ( 8)
Header Checksum(16)
Source P Address
Destination iP Address
Options(if any)
life. augmented
P Packet Header
9
Type of Service(TOS)
Allows different types of service to be requested
Initially, meaning was not well defined
Currently being defined(different service)
Version(4) Hdr len(4)
TOS(8)
Total Length in bytes( 16)
Identification( 16 bits)
Flags (3)
Fragment Offset(13)
Time to Live(8)
Protocol (8)
Header checksum(16)
Source P Address
Destination P address
Options(if any)
life. augmented
P Packet Header
10
Packet Length(in Bytes)
Unambiguously specify end of packet
Max packet size =216=65, 535 Bytes
Version(4) Hdr len (4)
TOS(8)
Total Length in bytes(16)
Identification (16 bits)
Flags (3)
Fragment Offset(13)
Time to Live(8)
Protocol (8)
Header Checksum(16)
Source P Address
Destination P Address
Options(if any)
life. augmented
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