header length

I. TCP protocol  1. TCP provides reliability in the following ways:• ◆ The application is split into data blocks that TCP considers to be the most suitable for sending. The unit of information transmitted by TCP to the IP address is called the

How does TCP ensure reliable transmission? Validation mechanism: ensure that each data packet can be received, error check: ensure that the data packet is correct, traffic control: ensure that the receiver will not overflow. Sequence Number: ensure

IPv4 address 1. IPv4 packet header IP source IP address destination IP address TTL-the 8-bit TTL field describes the maximum number of hops that can pass before a packet is discarded or can be transmitted. After data packets are processed, each vro

/*------------------------------------Network Fundamentals: 1. Binary data stream--------------------------------*/ Client: Mobile devices (handheld devices such as mobile phones/ipad).The client is usually front-end/foreground and so on.

First, the Mac frame header definitiontypedef struct _MAC_FRAME_HEADER{Char m_cdstmacaddress[6]; Destination MAC AddressChar m_csrcmacaddress[6]; SOURCE MAC AddressShort M_ctype; The previous layer protocol type, such as 0x0800 represents the

TCP/IP basics for network programming I. ISO/OSI Reference Model 1. OSI (opensysteminterconnection) open system interconnection model is a network layered model defined by ISO (InternationalOrganizationforStandardization, A total of seven layers ....

IP: Internet Protocol Unreliable: IP datagram cannot be successfully delivered to the destination, and only the best transmission service is provided. No connection: the IP address does not maintain any status information about subsequent datagram.

Q:Hello! I have read "using Raw Socket programming under C # To implement network packet monitoring" published on csdn, and I am very interested in it and it is very helpful to me. However, I have encountered some problems during the debugging

ACK message reflectionCode Author: Xiaojin # Include # Include # Define false 0# Define true 1 # Define seq 0x28376839 Int x =-1, K, J;Int rndx = 0; Struct IP{Char IP [20];}; Struct IP iptemp [32767]; Typedef struct ip_hdr //

Recently, some of my friends encountered some problems when writing network programs. Therefore, I posted the documents translated during ipmsg, hoping to help new users in network programming, if you are looking for a programming project, you can

IP datagram format  Figure 1. IP datagram format The version field is 4 characters long to indicate the IP version of the created datagram. The current IP version is IPv4 and IPv6 is in development. IPv4 is 0100. Header Length (header length) refers

Version (4bit) Header Length (4bit) Priority and service type (8bit) Total Length (16bit) Logo (16bit) Logo (3bit) Segmented offset (13bit) Survival Period (8bit) Protocol (8bit) Header

TCP Message FormatTCP (transmission Control Protocol Transmission Protocol) is a connection-oriented, reliable, byte-stream-based Transport layer communication protocol.The header of a TCP message segment has 10 required fields and an optional field.

TCP Message Format TCP (Transmission Control Protocol Transmission Control Protocol) is a connection-oriented, reliable, byte-throttling-based transport-layer communication protocol. There are 10 required fields and an optional field in the

Iron Learning Python_day34_socket Module 2 and sticky-pack phenomenon socketsSocket is a computer network data structure, which embodies the concept of "communication endpoint" in C/s structure.Before any type of communication begins, a network

The grouping at the IP layer is called a datagram. This section focuses on the format of the datagram and how the IP packet header format is defined in Linux.First, the format of the datagram is as follows:which1. Version: version 4 and version 62.

Use Python to write network packet sniffer (Code a networks packet sniffer in Python for Linux) by Silver Moon Basic SnifferSniffers is programs that can capture/sniff/detect network traffic packet by packet and analyse them for various reasons.

23.5.1 Ping Check the online status of the remote system. The ping command sends an ICMP packet to the specified host, which we can use to check the online quality of the network. Common parameters are as follows: Parameters

The general format of the ping command is:ping [-dfnqrrv][-c send number][-i interval seconds][-i network interface][-l Front load][-p template style][-s packet size][-t survival value [host name or IP address] Parameter description:-D uses the

A. TCP/IP protocol family TCP/IP is a protocol family, which is usually developed at different levels, each of which is responsible for different communication functions. Contains the following four levels: 1. The link layer, also known as the