ip 1

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Some views on TCP/IP (1)

There is less than a year to get ready to find a job, think about the experience of senior, found that the current self or weak explosion. So want to seize the time to enrich themselves, for later in the computer industry to find work lay the

Linux Source Analysis IP (1)--ip.h

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.

TCP/IP (1)-Protocol origin, hierarchy and basic knowledge

TCP/IP explanation (1) -- the origin, layering, and basic knowledge of the Protocol. Why does the TCP/IP protocol www.2cto.com exist all over the world, various computers run different operating systems to serve everyone. These computers use

Code learning in TCP/IP (1)

I would like to wait and read the books again. However, the company will have a seminar later. I will give you some comments! Open source is widely usedProgramPersonnel progress step by step, just a month to understand the realization of TCP/IP,

TCP/IP (1)

I. TCP/IP structure:TCP/IP is a layer-4 protocol with the following structure:1. Application Layer: various applications and protocols, such as HTTP and FTP.2. Transport Layer: TCP and UDPTCP provides a reliable transport layer service, But UDP is

PostgreSQL's network Address type

Official Document: Http://www.postgresql.org/docs/9.4/interactive/datatype-net-types.htmlFirst, CIDRpostgres=# create table test  (Id int, name text); create tablepostgres=# \d test      table  "Public.test"  Column |  Type   | Modifiers --------+---

The hidden trouble of the tar command of UNIX operating system and the solving method

Unix| solution at present, Unix operating system in China's financial sector is widely used, UNIX with its powerful functions (time-sharing, multitasking, multi-user, network interconnection, graphics interface, etc.), much favored by financial

Array address problems

Int _ tmain (INT argc, _ tchar * argv []) { Int ints [10] = { 10, 20, 30, 40, 50, 60, 70, 80, 90,100 }; Int * IP = ints + 3; } Q: Ints = 0012ff3c Ints [4] = 50 Ints + 4 = 0012ff4c * Ints + 4 = 14 * (Ints + 4) = 50 Ints [-2] =-858993460 & Ints =

Periodically monitor all server ports, if suspended, send alert messages

function: 1:ping IP address of all in-network machine, if not, send alarm2: Detect the service port of all machines in the network, if not, send alarm#!/bin/bash# #读取IP列表, test a port for IP # #While Read ip1DoPing-c 2 $ip 1 >>/dev/null 2>&1If

PHP implementation of online staff Library _php tutorial

Add Users function AddUser ($username) { Global $db; $Ip =getenv (' remote_addr '); $Ip 1 = getenv (' http_x_forwarded_for '); if ($Ip 1 = "") && ($Ip 1! = "Unknown")) $Ip = $Ip 1; $current _time=date ("y-m-d h:i:s"); $SQL = "Select User from

Nat type detection method

Part 1: Nat Introduction Various types of NAT (according to RFC) Full cone NAT: The Intranet host establishes a UDP socket (localip: localport). When the socket is used to send data to the external host for the first time, Nat will allocate a public

Nat type description and type detection

Original article: Http://choudaxian.blog.163.com/blog/static/1900141120090122925744/ (1) Full Cone: Nat maps all requests from the same internal IP address and port to the same external IP address and port. Any external host can send IP packets to

[Zz] P2P Nat type detection method

P2P Nat ResearchPart 1: Nat IntroductionPart 2: Nat type detection Part 1: Nat Introduction Various types of NAT (according to RFC) Full cone NAT: The Intranet host establishes a UDP socket (localip: localport). When the socket is used to send

luoguP3255 [JLOI2013] terrain generation dynamic planning

Tag: Line statistic string UTC = ... src comparison comThe language of the people is really good ...different labels and heights = each different label + individual height ...The first question is relatively simple, consider inserting from large to

P2P NAT Research

P2P NAT Research Part 1: NAT Introduction Part 2: NAT type detection Part 1: NAT introduction to various types of NAT (according to RFC) Full Cone NAT: the Intranet host establishes a UDP socket (LocalIP: LocalPort). When the socket is used to send

P2P Nat type detection method

P2P Nat ResearchPart 1: Nat IntroductionPart 2: Nat type detection Part 1: Nat Introduction Various types of NAT (according to RFC) Full cone NAT: The Intranet host establishes a UDP socket (localip: localport). When the socket is used to send data

PHP get IP, MAC address function

Parameter $aitype value: 1:ip,2:mac,3:ip+mac Returns the return string: address string function getclientaddr ($AiType =0){$sMac = "";$ip = getenv ("REMOTE_ADDR");$ip 1 = getenv ("Http_x_forwarded_for");$ip 2 = getenv ("Http_client_ip");($ip 1)?

Solve the DDOS problem of R9 VPNserver

Article title: Solving the DDOS problem of R9 VPNserver. 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.    1.

PHP Part FAQ Summary 1th 2 page _php tutorial

If there's something wrong or you have a better idea, welcome to keep abreast.Please check the PHP manual, MySQL manual and phpinfo settings before you ask questions.In addition, I hope you read the PHP programming standardphp manual Download

PHP Section FAQ Summary _php Tutorial

PHP Section FAQ Summary 1: Why don't I get the variable I post data on one page to another page name, why is the output $name not get any value? Register_global defaults to off in later versions of PHP4.2 To get a variable submitted from another

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