The differences between TCP, IP, HTTP, and SOCKET and the connection network are classified as follows: corresponding to the physical layer -- data link layer -- network layer -- IP protocol transmission layer -- TCP protocol Session Layer -- presentation layer and application layer -- HTTP protocol www.2cto.com socket is the encapsulation and Application of TCP/IP
Each node in various IP-PUBLIC-VIP-Private-scan ip 1, PUBLIC, and VIPOracle RAC in RAC has a virtual IP address (VIP), which is in the same network segment as the public ip. The vip is attached to the public network interface. The main difference between VIP and public ip is
Configure a range of IP
Under Linux, configuring multiple IPs is usually eth0.0. eth0.1.. eth0.x and so on, then if you want to configure a large number of IP, so configuration is also possible, but cumbersome, although this situation is very small.For the addition of a large number of IP, there are certain provisions, the Rhce/centos system provides a fast way
Before php5.2 if we want to verify that the IP address is valid we need to use the regular to verify that this is only the IP address is not legal, if it is valid we need to call Ping to operate, but after php5.2.0, there is a special function to do this judgment, let me summarize these functions
Determine if it is a legitimate IP
The code is as follo
PHP hidden IP address Two-bit display as an asterisk method, IP asterisk
This example describes the two-bit display of the PHP hidden IP address as an asterisk. Share to everyone for your reference. The implementation method is as follows:
We in many public websites will encounter the display user's IP when the next f
Tags: Ar use SP Div on Art Work BS Management Today's IP networks use 32-bit addresses, represented in dotted decimal notation, such as 172.16.0.0. The address format is: IP address = network address + host address or IP address = Host address + subnet address + host address.IP address typeIn the initial design of the interconnected network, to facilitate address
How to query your network IP address?
What is a network IP address? The network IP address is the Internet IP address after we successfully connect to the network. This address is uniform and cannot be modified by the user. The IP network address here is provided by the n
This approach is not very efficient, if used in the web, if used less can be used in this way, if used, or recommend the use of IP library
Copy Code code as follows:
#region # #得到真实IP以及所在地详细信息
Get real IP and location details (Porschev)
public string Getipdetails ()
{
String url = "Http://www.ip138.com/ips8.asp"; Set up a URL to get the
What is a private IP address, and what is the function of a private IP address?
A particular type of IP address is called a private IP address. In the current network, the IP address is divided into public IP and private
TCP/IP Note 2. Network Layer (1) -- IP, subnet, CIDR1. IP1.1 supporting agreementIP is one of the two most important protocols in the TCP/IP system.There are also four protocols used in combination with the IP protocol:(1) ARP (Address Resolution Protocol) Address Resolution Protocol(2) RARP (Reverse Address Resolution
PHP restricts IP access and only allows access from specified IP addresses
/**
* Check whether the Accessed ip address is a specified allowed ip address.
* Enter description here...
*/
Function check_ip (){
$ ALLOWED_IP = array ('192. 192. 2. * ', '192. 0
Today, we have encountered the problem of implementing multi-network segments in Linux. In the past, we only had to pay attention to how to modify the Linux route. When using the 2003 system, we often access multiple network segments with a single Nic. The premise is to bind an IP address for each CIDR block first. Similarly, if we need to enable the Linux Nic to access multiple network segments, we must first bind multiple
1. static IP routing 1. 1. A simple route table
Routing is one of the most important functions of the IP layer. The previous section briefly describes the rules used by the router to select a route based on the IP address of the IP packet. We will not repeat it here. First, let's look at a simple system route table.Des
Label: style blog HTTP color AR for SP Div log Public static string getipaddr (httpservletrequest request ){
String IP = request. getheader ("X-real-IP ");
If (! Stringutils. isblank (IP )! "Unknown". inclusignorecase (IP )){
Return IP;
}
Tags: sys ref linux 16px today font input dev secondaryToday, when viewing a virtual machine, you find that a network card contains multiple IP addresses:eno16777736: theQdisc Pfifo_fast State up Qlen +Link/etherxx: 0c: in: 6b:a5:a2 BRD ff:ff:ff:ff:ff:ff inet192.168.213.132/ -Brd192.168.213.255Scope Global Dynamic eno16777736 valid_lft 1726sec preferred_lft 1726sec inet192.168.213.34/ -Brd192.168.213.255Scope Global Secondary eno16777736 valid_lft fo
TCP/IP stack attacksTwo of the following types:
Scanning: scanning or tracking footprints are part of the hacker's initial information collection process. Before hackers can attack a system, they need to collect information about the system, such as network layout, operating system type, available system services, and system users. Hackers can deduce possible vulnerabilities Based on the collected information and select the best attack method for the
Share the PHP implementation of the IP access restrictions of two pieces of code, divided into a limited number of single IP access and restrict access to the IP segment of the two code, the need for a friend reference.
Add IP Access Restrictions
if (getenv (' http_client_ip ') strcasecmp
Acquiring a place of attribution via IP
Get IP Address
$ip = $_server[' remote_addr '); Automatically get the IP of the client
IP-Corresponding region
if (!empty ($_post[' IP ')) {
$i
Common linux practicesIptables reference rules The code is as follows:Copy code Iptables-I INPUT-p tcp-dport 80-m-mac-soruce $ MAC-j DROPIptables-I INPUT-p tcp-dport 80-s $ IP-j DROP IP address-based Method 1,First, create the following configuration file and place it under the nginx conf directory, and name it blocksip. conf:Add the following code: The code is as follows:Copy code # Shielding soso
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