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1, the rapid establishment of TCP scanning method We all have an experience, is to the network card work to the high speed is not easy, 100M network card traffic to 60M is about the same. But a lot of the test equipment, such as smartbit in the

First, the network program based on TCP protocol The following figure is a general process for client/server programs based on TCP protocol: After the server calls the socket (), bind (), listen () completes initialization, calls the accept ()

Keep your Web site Defensive DDoS attack guide, with the increase of Internet network bandwidth and the rapid development of multiple DDoS hacker tools, DDoS Denial-of-service attacks are becoming more and more easy, and DDoS attacks are on the rise.

In recent years, the computer network, especially the Internet development is very rapid, ATM and IP over DWDM technology development so that the network transmission bandwidth quickly increased. While the development of network security and

First, the basic principle of firewall 1, what is the firewall? Isolate a defense system between a local network and an outside network In layman's terms, the firewall is a fireproof wall, the main purpose is to isolate fire and establish a safe

Two modes of operation of FTP protocol: Active mode active and passive mode passive FTP is a data transfer Protocol (File Transfer Protocol) that has two types of connection modes: Active mode (active) and passive mode (passive). The following

Enterprise Port Scan Policy 1, the purpose of port scanning for the computer system located in the network, a port is a potential communication channel, that is, an intrusion channel. Port scanning of the target computer can get a lot of useful

Two modes of operation of FTP protocol: Active mode active and passive mode passive FTP is a data transfer Protocol (File Transfer Protocol) that has two types of connection modes: Active mode (active) and passive mode (passive). The following

Security | Network Gong (yiming@security.zz.ha.cn) Core member of China Telecom Network security Group December 2001 Through the Httptunnel technology of this paper, while escaping the shield of firewall and the tracking test of the system, we can

A few days ago, on Sina Weibo, I had two study questions about TCP, which sparked a discussion http://weibo.com/1701018393/eCuxDrta0Nn. The first primary topic is: There is a machine, it has an IP, the above run a TCP service program, the program

Let's review the TCP content in my previous "established options in ACL". As said before, TCP establishes a connection in the three-time handshake process, the first message sent by the other party sets the SYN bit, when a device receives the

One: EIGRP Introduction: eigrp:enhanced Interior Gateway Routing Protocol-Enhanced Internal Gateway routing Protocol, protocol number 88. EIGRP is a private agreement between Cisco companies. Cisco is the inventor of the agreement and the only

Recently, using tcpdump to study and analyze TCP parameters, the results of the grab package under Linux at first made me wonder that Ubuntu and Debian had the same phenomenon on hand. The specific is to catch the sender of the TCP data segment of

DoS (Denial of service denial-of-service) and DDoS (distributed denial of service distributed Denial-of-service) attacks are one of the security threats to large Web sites and network servers. The attacks on Yahoo, Amazon and CNN in February 2000

You can count the current number of connections by following this command Netstat-n | awk '/^tcp/{++s[$NF]} end {for (a in S) print A, s[a]} ' This statement returns the following results 1.time_wait 346 2.FIN_WAIT1 85 3.fin_wait2 6

Some time ago, I was told by a colleague that there are a lot of message status for receive in the client, which can only be consumed if the JMS server or WebLogic server is fully charged. After investigation, this problem may be a bug in the

A good dial-up software to optimize the broadband network communication software-Cfosspeed First of all, be sure to remember that this software will not improve your physical bandwidth! Its function is to let your download upload all reach the

First, the principle of DDoS incursion DDoS is the abbreviation of the English Distributed denial of service, that is, "scatter denial of service", the DDoS invades the principle to roughly divide into the following three kinds: 1. After sending a

1. View Neighbor Table R2#show IP eigrp Neighbors IP-EIGRP Neighbors for Process 90 H address Interface Hold Uptime SRTT RTO Q Seq (sec) (MS) Cnt Num 1 12.1.1.1 se0/0 12 00:03:46 50 300 0 2 0 23.1.1.3 SE0/1 13 00:03:49 66 396 0 2 Queue: (qcnt)

1. FTP protocol Overview FTP is the abbreviation for File Transfer Protocol (Transfer Protocol). FTP is a specific application of TCP/IP, it works on the seventh layer of the OSI model, on the fourth layer of the TCP model, the application layer,