Abstract:
In view of the slow transmission speed and difficult network connection of traditional devices, a Data Conversion System for serial ports and Ethernet is proposed using w5300 and c8051f120 single chip microcomputer. the RS232 and RS485 chips are used to receive and send low-speed serial data, the single-chip microcomputer c8051f120 is used as the core processing chip, and the w5300 chip is used to send and receive
Python uses Raw Socket for Ethernet frame injection and pythonraw1. Frame Injection
For introduction to Ethernet frames and Raw sockets, refer to a previous blog post that uses Raw Socket for Ethernet frame sniffing. Frame injection features:
Packages in the original data format can be injected into the network.
It is very powerful in simulating network resp
The principle of automatic Ethernet negotiation and related network test automatic negotiation are one of the most controversial concepts in Ethernet. Is it good or bad? This depends on the situation. When you use automatic negotiation, the supply, driver version, and administrator selection are all considerations. Www.2cto.comWhat is automatic negotiation? Article 802.3 of the 28th standard defines the aut
Ethernet Channel AnalysisEthernet channel ------ it is intended to review previous learning and not to wasteNote Ethernet conditions:1. The member ports must be in the same slot module. 2. The member ports must have the same type (1-gigabit electrical ports, 1-gigabit optical ports, and 10-Gigabit electrical ports) and speed 3. The member ports must work in full duplex mode 4. A maximum of 16 trunks can be
More and more Wan solutions are now using Ethernet overSDH. On the surface, L3 switches and traditional routers can meet the needs of Wan interconnection. Therefore, many partners and customers have this question, what is the difference between the two in the wide area network connection? The following are some of my opinions for your reference.What is the difference between using a Cisco L3 switch and using a router as a WAN connection?First, the net
datagram into a frame format that is suitable for transmission on the physical network, or to unpack the frames received from the physical network and take out the IP datagram to the network layer.5. The physical layer , which is responsible for transferring the bitstream between nodes, is responsible for the physical transmission. The protocol for this layer is related to both the link and the transmission medium.Ethernet FrameSince the physical layer is more related to physical media, the ana
In Solaris, how to configure the fc hba to an Ethernet Card IPFC can easily set a fc hba to an Ethernet card, which is of great significance. In some work sites, if you need to copy a large amount of data through the network, you will often find that the speed of the Gigabit Nic is insufficient, and network aggregation cannot compensate for bandwidth insufficiency, at this time, you can make full use of the
Ethernet II Frame format
DA
Sa
Type
Playload
Fcs
DA (Destination address): This field has 6 bytes, which represents the destination MAC address.SA (source Address): This field has 6 bytes representing the source MAC address.Type: The field has 2 bytes, which represents the type of the packet.Playload: Data payload.FCS (Frame Check Sequence): This field has 4 bytes, which represents the frame check sequenc
Recompile kernel (2.6.29)2.6.29 kernelDevice Drivers---> USB support---> USB Gadget Support--->where USB peripheral controller selected S3C2410 USB Device controllerThen choose a Gadget driver from the kernel to do the demo, here is the Ethernet Gadget (with CDC Ethernet support)Because this driver does not need to pass in the parameters, so give a y instead of M, easyMake and burn zimage to mini1440After t
1. Raw Socket Base
Provides a way to bypass the entire network stack traversal and deliver Ethernet frames directly to an application.
There are a number of ways to create raw sockets, such as Af_packet,pf_packet. Here you use Pf_packet, which is an option on a Linux system, and if it's a Windows or Mac system, you can use Af_packet.
1.1 Pf_socket
Receive and send packets on the link layer to the application interface.
A
WIZ550S2E is a gateway module that provides RS-232 to TCP/IP protocol functionality. And can be based on TCP/IP and Ethernet network equipment management, remote measurement, only need RS-232 serial port to connect the current device. In other words, WIZ550S2E is a protocol converter that sends data through the serial port in TCP/IP data format, and vice versa.Characteristics
Plug and Play serial to Ether
Ethernet Switch by enterprise Application network is mainly divided into two categories, one is to use the protocol converter to switch to Ethernet access switches, the second is to rent bare fiber directly. Specifically, the three-tier switch selected in 三、四级 network can only be configured with simple dynamic routing protocol, simple Policy Routing, QoS and simple access control functions, and in fact, thi
interface can serve multiple users at the same time, delivering fibre based business for them. As a result, the PON device that provides business for the same number of customers is smaller and occupies less space in the Central Bureau compared to the method of configuring End-to-end fiber for each user.
Pon also supports traditional services (common legacy telephony (POTS), Analog TV) and broadband services (IP voice transmission, IP digital TV, network TV, etc.).
PON supports all residentia
Q: I am currently building a network architecture where users are unwilling to set up network rooms due to the high rents of the buildings and require that the Cisco 2900 Series LRE XL device be leased for Ethernet connection devices. I am opposed to the use of the device, because it does not meet the tia/eia-568 standards in the cable requirements, how to use the Cisco 2900 Series LRE XL remote Ethernet tr
The Ethernet MAC address uniquely identifies each Ethernet device in the world. Each manufacturer of network equipment must write the MAC address into its device (e.g. Ethernet network card, router, switch, etc.) beforehand. Various media have many articles about how to get a MAC address. Today we mainly discuss how to obtain and change MAC address in Cisco IOS,
1. Metro access
1. High-speed access requirements
Bandwidth acceleration is a significant feature of the rapid development of modern information society. From the operator's perspective, the demand for Household broadband acceleration, the emergence of IPTV operations, the construction of 2G/3G and LTE base stations and core networks, the expansion of business outlets and OSS systems, all of them propose IP, broadband, and comprehensive access requirements for the transmission network. From the
TCP/Socket learning --- Ethernet (RFC 894) frame format where the source address and destination address are the hardware address (also called MAC address) of the network card, and the length is 48 bits, it is fixed at the factory of the NIC. Run the ifconfig command to check that the "HWaddr 00: 15: F2: 14: 9E: 3F" part is the hardware address. The protocol field has three values, corresponding to IP, ARP, and RARP respectively. The end of the frame
Article Title: installation and configuration of the Ethernet Card in Linux. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source.
The Linux operating system is favored by more and more people of insight with its unique openness, stability, and efficiency. As IT giants announce their support for Linux, Linux is rapidly e
/** * Get local IP * @return */private string getlocalipaddress () {try {String IPv4 = null; listGet MAC address via IP/*** get MAC address * @return */@SuppressWarnings ("finally") via local IP privatestring GETLOCALMACADDRESSFROMIP () {Stringmac_s= "";try{byte[]mac; Stringip=getlocalipaddress ();if (! Inetaddressutils.isipv4address (IP)) {returnmac_s;} Inetaddressipaddress=inetaddress.getbyname (IP);if (ipaddress==null) { returnmac_s;} Networkinterfacene=networkinterface.getbyinetaddress (ipAd
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