linux block ip address

The IP address is like a phone number, but the area code is required for dialing a phone number from another country. The subnet mask is required for accessing other network segments in the network. The IP address must be classified as if the IP

This is a thesis composition. Recently always wanted to write something, but have been unable to find the topic, just received an e-mail, someone asked me the layout of the Linux routing table problem and the problem of routing cache, in addition to

How to block a large number of malicious IP addresses in Linux In many cases, you may need to block IP addresses in Linux. For example, as an end user, you may want to avoid the troubles of spyware or IP tracking. Or when you are running P2P

Http://blog.chinaunix.net/uid-346158-id-2131136.html   In linux, apart from primary, there are two types of IP addresses:1. ip alias (sub-interface)2. secondary ip (secondary ip)Can be added to a physical network card. alias is added by ifconfig.

A thorough understanding of Cisco, Linux, and Windows IP routing-1. As long as you understand the essence, the name is not important! Many Linux-based network experts consciously beat Cisco administrators in terms of management distance, route

In many cases, you may need to block IP addresses under Linux. For example, as an end user, you may want to be immune from spyware or IP tracking. Or when you're running the peer software. You may want to filter the Internet links for anti-peer

TCP/IP protocol stack This section briefly introduces the internal structure of TCP/IP and lays the foundation for discussing Internet-related security issues. TCP/IP protocol groups are popular in part because they can be used on a variety of

Introduction: This article as a theoretical basis, will tell us the basic principles of TCP/IP and important protocol details, and on this basis, introduced the implementation of TCP/IP on Linux.OSI Reference Model and TCP/IP Reference ModelThe OSI

The problem of Netfilter/iptables In Linux, it is easy to use the Netfilter/iptables framework to prohibit IP addresses: The code is as follows: $ sudo iptables-a input-s 1.1.1.1-p tcp-j DROP If you want to completely block an IP address segment,

Because the company's intranet gateway and intranet IP address is not in a network segment, linux can not connect to the Internet, the solution is as follows: 1.vim/ etc/rc. local2. add the following two