With the improvement of social informatization, information demand has been developed from simple data information to interactive multimedia information, from special service to digital, voice, image Unified service and integrated network. The traditional IP network has been unable to meet the needs of new business, the development of new business has created a "bottleneck." In this case, the broadband IP
Some netizen message asks a question: Why installs the operating system to be unable to surf the net. My answer is: the normal Internet access depends on three: 1. There is no problem with the NIC and its driver; 2. There is no problem with the system network connection settings; 3. There is no problem with the network provider "Freeway". For the specific analysis of ne
whether there is a different MAC address in the packet of the same IP address, and if so, the user should share the Internet. Cracked the officeThe method is to change the MAC address of each machine to the same. The modified method is as follows:The first thing to get the Mac:mac address of this machine is the physical address of the serial eeprom that is cured on the network card, usually 48 bits long. ToThe ne
Network | Network Office Build Network Office Platform 1
[Author: Sun Cheng posted Since: Site Original hits: 60 Update Time: 2003-12-11 article entry: Tjrao]
Easy to build network office platform in LAN
The rapid development of the network today, e-commerce, e-government
reuse the input of data streams of different applications on the same host, it also includes the re-sorting function for packets that are not in the correct order. Example: TCP, UDP, and SPX.
(5) network layer: This layer defines the end-to-end packet transmission. It defines the logical addresses that can identify all nodes, and also defines the routing implementation and learning methods. To adapt to the transmission medium whose maximum transmissi
outputs an NFS handle that is not decoded. -v output A slightly more detailed information, such as the TTL and the type of service that can be included in the IP packet. -vv output detailed message information. -w writes the groupings directly to the file instead of parsing and printing them out.Example: Tcpdump-n-i eth0 DST 192.168.31.147 or 192.168.31.157 and TCPKey words:About types of keywords: host,net,portKeywords to determine transmission direction: SRC,DST,DST or SRC,DST and SRCProtocol
chart tries to display the positions of different TCP/IP and other protocols in the original OSI model:
7
Application Layer
Such as HTTP, SMTP, SNMP, FTP, telnet, sip, ssh, NFS, RTSP, XMPP, Whois, ENRP
6
Presentation Layer
For example, XDR, ASN.1, SMB, AFP, and NCP
5
Session Layer
Such as ASAP, ssh, ISO 8327/CCITT x.225, RPC, NETBIOS, ASP, WinSock, BSD sockets
4
Transport Layer
For example, TCP, UDP, TLS, RTP, sctp, SPX, ATP, and IL
Objective
Only a bald head can become stronger.
Review Front:
After reading this Linux basic operation will be
Linux User and Rights Management look, you're going to use it.
Linux Process Management
This article mainly explains the management of the network under Linux .Then let's start, if the article has the wrong place please forgive me, not hesitate to comment on the area Oh ~
Disclaimer: Based on Cento
Starting with JDK1.4, Java provides a NetworkInterface class. This class can get information about all the physical network interfaces of the machine and the logical network interfaces that the virtual machines and other software use to create the physical network interface of the machine.First, Create NetworkInterface two static methods for an objectThe Networki
64, the network security under the Winows NT4.0
Hot Network
In the network multiuser environment, the system security, the permission setting is very important, Windows NT 4.0 provides a successful security secrecy system under the network environment. Windows NT from the initial development to the current use of a wi
Docker officially recommends users to use their own custom network, so it is best to use a custom network when using the container, the default Docker use the Bridge network, the bridge network under the Docker container can not resolve each other's container name. If you need a container to be able to communicate over
Wireless network card is the equipment of the terminal wireless networks, wireless LAN wireless coverage under the wireless network for Internet access to the use of radio terminals. Specifically, the wireless card is a device that allows your computer to use wireless to access the Internet, but with wireless network card also need a can connect Wi-Fi, if in the
Management and maintenance of the local area network is a very annoying thing, because the network administrator will often face such a problem, that is, set up their own LAN parameters, was modified by other people, resulting in the network can not connect normally, after the failure, they must also be a failure of the computer to be carefully excluded,
Until t
Network application is the reason why computer networks exist. If we don't envision any useful Web applications, then there's no need to design a network protocol that supports them. However, in the past 30 years, many people have devised a large number of sophisticated Web applications. These applications include text-based classic applications that have been popular since the the 1980s, such as remote com
Part One: Remote host login and campus network registration under LINUXRemote management of the target host in the campus network log in programThis program for the campus network remote login, management functions, the program sub-server and client two parts: server side for remote_server_udp.pyThe client is divided into unicast clients and broadcast clients:Uni
In our real life, many complex systems can be modeled as a complex network for analysis, such as common power networks, aviation networks, traffic networks, computer networks, social networks, and so on. Complex network is not only a form of data, but also a means of scientific research. Research on complex networks has received extensive attention and research, especially as various online social platforms
802.11, FDDI, PPP
Physical LayerFor example, line, radio, and optical fiber
Advantages of layering:
Each layer is independent.
Good Flexibility
Structure can be split
Easy to implement and maintain
Promote standardization
Related Concepts:
Entity)Any hardware or software process that can send or receive information
ProtocolA set of rules that control the communication between two peer entities (The Protocol is "horizontal" and the rule f
PresentationLayer Presentation Layers
Data formatting, code conversion, data encryption, etc.
Telnet,rlogin,snmp,gopher
Session LayerSession Layer
To release or establish contact with other contacts
Smtp,dns
Transprot Layer Transport Layers
Transfer Layer Transport layers
Provides an end-to-end interface
Tcp,udp
Four-layer delivery machine, four-layer router
2. Linux Network Configuration 2.0 IP address configurationHow to configure IP addresses for Linux
Ifconfig command temporarily configures IP address
Setup tool permanently configures IP address
To modify a network configuration file
Graphical interface configuration IP address (slightly)
2.1 ifconfig Command
ifconfigCommand: View and configure
metropolitan or wide area network, a medium or long distance single-mode fiber can be used to connect.
DPT is based on more advanced WDM technology, but it can be compatible with today's widely used TDM based SONET/SDH, while you can connect the network directly to DPT without SONET/SDH. This wide range of compatibility provides manufacturers with ample choice and the possibility of scaling up, and is a g
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