osi protocol stack

Linux2.6 kernel protocol stack series-TCP protocol 1. Send, linux2.6 -- tcp Before introducing the tcp sending function, we must first introduce a key structure sk_buff. in linux, The sk_buff structure represents a packet: See the sending function source code. Here we do not focus on the scattered hardware-aggregation: /* Sendmsg System Call implementation at th

Read Catalogue I. Operating System Fundamentals Two. Principles of network communication 2.1 The essence of the Internet is a series of network protocols 2.2 OSI layer Seven protocol 2.3 TCP/IP five-layer model explained 2.3.1 Physical Layer 2.3.2 Data Link Layer 2.3.3 Network Layer 2.3.4 Transport Layer 2.3.5 Application Layer 2.3.6 socket Three. Network

(segment). Session Layer: Manages the session process between hosts, including management during session creation, termination, and sessions. The presentation layer (presentation Layer): The presentation layer transforms the data transmitted by the network, so that the information transmitted between multiple hosts can understand each other, including data compression, encryption, format conversion and so on. Application layer (Application Layer): The application layer communicates with the app

TCP/IP protocol family 1.1 Introduction The TCP/IP protocol family consists of 5 layers: Physical layer, Data link layer, network layer, Transport layer and application layer. The first four layers correspond to the first four layers of the OSI model, providing physical standards, network interfaces, Internet connectivity, and transport capabilities. The applic

and implements the service quality support module. The specific code is located in the net/sched/directory. In Linux, this function module is called traffic control (TC. First, let's take a look at the general process of sending data packets when the Linux network protocol stack does not have a TC module. 1. Note: The layering is based on Linux implementation and does not strictly abide by the

ARP Protocol Analysis Layer 3 of the OSI model is the data link layer, which provides a data transmission mechanism between network nodes. The important reason for this layer is that it is responsible for dividing data into frames for transmission. There are many insecure factors worth exploring on the data link layer, but the most important is the IP Address Resolution

1. Use of MicrochipZigBee protocol stack (1) Prepare hardware, install source files and development tools You can purchase the PICDEMZ demo toolkit for the MicrochipZigBee protocol stack in China. You can purchase a set of tool kits to test the ZigBee protocol. In addition,

In open-source systems, the use of some protocol stacks may be slightly different. Below we will explain several common open-source protocol stacks for your detailed explanation and comparison. For more information, see the following section. First, let's take a look at the BSD TCP/IP protocol stack. 1. BSD TCP/IP

network Interface Layer : This is the lowest layer of the protocol stack, corresponding to the OSI physical layer and Data link layer, the main completion of the actual data frame transmission and reception.Network layer : The process of grouping activities in the network, such as Routing and forwarding, this layer mainly includes IP

service carrier network and based on GSM GPRS technology from the point of view of the protocol stack in-depth analysis. Second, GPRS network structure and network element function (1) Network topology structure of GPRS (2) GPRS function of each network element PCU function: The functional entity can be combined with BSC, or as a separate network element, and the GB interface between the SGSN and the s

westward movement, so this paragraph stopped.By extension The routing table for the protocol stack is meant to be found, not to mention the Cisco Express Forward (CEF system), which is enough to route the cache.Early Linux (up to 2.6.39 in the past.) Don't talk about 3. X), in the System routing table first and build a route cache, each cache table entry is a successful routing query results, built-in a ti

We know that the tcp ip protocol stack includes many protocols. So let's take a look at the functions and functions of the protocols here. Now let's make an inventory check to help you summarize it and hope it will help you. 1. bsd tcp ip protocol stack BSD stack is the star

westward movement, so this paragraph is stopped.By the way, the routing table for the protocol stack is meant to be found, not to mention the Cisco Express Forward (CEF system), which is enough to route the cache. Early Linux (up to 2.6.39, not 3.X), in the System routing table first and built a route cache, each cache table entry is a successful route query results, built a time-out expiration. The Linux

MsstatePAN protocol stack transplantation of ZigBee [Date:] Source: MCU and embedded systems Author: Chen Yanming, Harbin Institute of Technology, Wang qiuguang [Font:Large Medium Small] 　 Wireless Sensor Networks (WSN) are task-oriented self-organizing Networks composed of multiple nodes. They generally do not require high channel bandwidth, however, it should have a low transmission d

We also talked about the SIP Protocol and related SIP protocol stack. In this paper, we propose a software structure and design implementation scheme of the software telephone based on the SIP protocol. this solution is based on the embedded Windows CE platform. The middleware uses the Open-Source SIP

1. Linux Network Path 1.1 Sending End 1.1.1 Application Layer (1) Socket The application layer of the various network applications are basically through the Linux Socket programming interface and kernel Space network protocol stack communication. Linux sockets are developed from BSD sockets, one of the most important components of the Linux operating system, which is the foundation of a network application

Internet Protocol stack Internet Protocol stack:Application Layers Application layer, transport Layer Transport layer, network layer, link layer data link layers, physical layer physical layers7-layer ISO OSI Reference Model:Application layer, Presentation layer presentation layers, session layer, Transport layer, netw

Internet technology in wireless networks. At the same time, the huge interconnectivity of the global Internet is a great incentive. Because small devices such as sensors are often required to be small and cheap, the implementation of network protocols must handle limited computing resources and memory. This article describes the design and implementation of a small TCP/IP protocol stack that becomes LWIP.

to define a confidential operation, so this definition makes it easy to cram everything into UNIX. UNIX network programming tells you that you just need to write a small, lightweight server to get UNIX to do all the work. A persuasive thing can help the author of the "tens of millions of concurrent secrets-the kernel is the root of the problem" to express the deep malice, that is, Linux once implemented a Web server in the kernel, what a huge joke, or a huge irony of the macro kernel ... The th

Abstract:The flexibility of the network protocol stack of embedded systems is an important indicator in applications. This article introduces the MUX (mutiplexer) interface of the VxWorks network protocol stack of the embedded operating system and its usage. Keywords:VxWorks network