// All. h// 2005/06/20, A.M. wenxy# Ifndef _ all_h# DEFINE _ all_h# Include # Include # Include # Include # Include # Include Socket. H># Include # Include # Include //---------------------// Create the ARP packet header file# Include # Include /* # Include # Include # Include //---------------------# Include # Include # Include Using namespace STD;# Define max_mac_len 24 // Maximum length of the Mac string buffer (byte)# Define compart_mac ":" // delimiter of the Mac string. warnning: modify th
Http://wenda.tianya.cn/question/27f9476d1e86f6b6
I. IP AddressI believe everyone is familiar with the IP address, that is, the 32-bit address assigned to the host using the TCP/IP protocol. An IP
1 Basic ConceptsAn IP address is an Internet protocol address, each Internet package must have an IP address, and each Internet service provider (ISP) must request a set of IP addresses from the organization concerned, and then ge
I found a lot online,CodeThere are not many details about the principles.
I 'd like to explain a few articles.
One TechnologyArticle, The most important thing is to clarify the principle, if there is a complete operationSource codeAlso, the key is to clearly analyze the core part of the code.
(1) origin:
Most computers use dynamic IP addresses to access the Internet. Intranet IP addresses are alloca
configuration file, the server extracts the client's static address from the configuration file and places the address in a DHCPThe offline message is sent back to the user.
(3) After receiving the DHCP offer packet, the customer selects a server among the numerous servers, which is usually determined by the options provided in the DHCP offer packet.
(4) The customer broadcasts another DHCP request message
Looked at many times, just to sort out my understanding of the whole communication process, the following, will continue to learn to supplement the correction:When communicating using the TCP/IP protocol family, there are three key identifying information: MAC address, IP address, and port number.
The MAC
Network broadcast address calculation method: (1) bitwise AND operation on the IP address and subnet mask to obtain the network address (2) "inverse" Operation on the subnet mask, then perform the bitwise OR operation with the network address to obtain the
In the campus network, the most convenient way to make trouble is to steal someone else's IP address, the computer that is embezzled IP address not only can not use the campus network normally, but also will frequently appear the IP addr
Tag: Address will refresh physical Add service based on primary DNS updateAs we all know, each piece of network card at the factory burned the world's only MAC address, use this address can be in the network to identify different computers. At the same time, the Internet also uses IP
650) this.width=650; "src=" http://imga.chrome001.com/article/201603/24/2145032eeekhcvevwinciu.png "border=" 0 " Class= "Shadow" alt= "My IP Address" style= "border:0px;vertical-align:middle;margin-bottom:0px;"/>Plugin Introduction:Many times we need to use the IP address, this noun may be known to everyone, but do you
Http://blogold.chinaunix.net/u1/43206/showart_518836.htmlSocket INADDR_ANY listens to the 0.0.0.0 address. The socket only binds the port so that the route table decides which ip address to transfer.INADDR_ANY indicates the address 0.0.0.0. In fact, this address indicates an
This article mainly introduces the thinkphp to obtain the client IP and IP address query method, combined with the case analysis of the thinkphp for the client IP address operation of the relevant functions and the use of skills, the need for friends can refer to the next
T
In the LAN, we often encounter the situation of IP address conflict, in fact, because others arbitrarily modify the IP address caused by, this article for you to introduce some methods to prohibit the modification of IP address.
Read the premise: you need to know what the IP address Purpose of this chapter: to realize the mutual transfer of IP address and long type value I. Scope of APPLICATION Typically used in requirements such as login restrictions, locating IP cities, and so on, Windows's ping
DHCP server and configure the IP address pool. However, this IP address pool should not be the same as the IP address you want to allocate, otherwise it will be a lot of trouble. For example, if you want to assign an
Each Ethernet device has a unique MAC address at the factory, why do I need to assign an IP address to each host? or if each host is assigned a unique IP address, why should a unique MAC address be embedded in the production of a
ThinkPHP uses the UTFWry address library for IP address locating. The extension class can also be included in the official http://www.thinkphp1.cn/extend/223.htmldownload iplocation extension class library, download expansion package (http://www.thinkphp1.cn/down/253.html) also contains the extension class. If the upload class Library is downloaded separately, pu
simple. script udhcpd. conf
For example, when using udhcpc
You can use simple. script directly without changing the name. The default directory file in busybox is/usr/share/udhcpc/default. script.
You can view help
# Udhcpc -- help
BusyBox v1.14.1 (10:35:16 CST) multi-call binary
Usage: udhcpc [-Cfbnqtvo] [-c CID] [-v vcls] [-h hostname] [-I INTERFACE]
[-P pidfile] [-r IP] [-s script] [-O dhcp-option]... [-p n]
-V classid Vendor class identifier
-I I
One, about Taobao IP address library
The services we currently offer include:1. According to the IP address provided by the user, the geographic and geographic information of the IP address is quickly queried, including the state
In RedHatlinux, after installing the linux system, set a fixed IP address for the NIC (bound to two IP addresses), and then configure the nic ip address in command mode. The configuration file is usually/etc/sysconfig/network-scripts/ifcfg-interface-namewww.2cto.com1. config
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