icmp flood

ICMP is an Internet Control Messaging Protocol (PROTOCOL). It is a child protocol of the TCP/IP protocol family that is used to pass control messages between IP hosts and routers. Control message refers to network communication, whether the host is up to, whether the route is available or not. Although these control messages do not transmit user data, they play an important role in the transfer of user data. The most closely related functions in Linux

When a protocol is used, sometimes some faults may occur. How can we handle them in some devices? Today, we have provided some examples of ICMP faults to help you analyze and provide some solutions. What's the problem? First, let's describe it. Although there is no obvious exception during the operation of the router, it is often seen such a log: "209.24.79.200" is the router's uplink interface address, I don't know why there are so many

transfer unit MTU Logo: Occupies 16 bits, it is a counter that is used to generate the identity of the datagram logo (flag): 3-bit, currently only the first two bits have meaning The lowest bit of the MF flag field is the MF (more Fragment) mf=1, which indicates "There are shards" later. Mf=0 represents the Last Shard The one in the middle of the DF flag field is df (Don ' t Fragment) allows sharding only when df=0 chip Offset: Occupies 12 bits, which refers to the relative position of a piece

In network communications, it is often necessary to determine whether a remote host survives to determine the next operation. Can be implemented directly using ICMP protocol, but to consider a lot of protocol details, to achieve more cumbersome. There are ready-made functions available in Windows ' own ICMP library, so just fill in the appropriate data structure before using it. The following is the data s

On an explanation of the wireless security topic _ attack-interference communication, not on the home to stay for a long time to be taken down, it seems after not only to explain the attack combat, but also to carry out technical principles and defense methods of the explanation. This article is about the local area network Mac flooding attack, the main purpose of this attack is to steal the local area network communication data, such as FTP account and password, the following actual combat is t

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 were carved into the history of major security events. Because of its good attacking effect, SYN Flood has become the most popular DOS and DDoS attack method at present. SYN

1.IMCP Protocol IntroductionAs mentioned earlier, the IP protocol is not a reliable protocol, it does not guarantee that the data will be delivered, then, naturally, the work of ensuring that the data is delivered should be done by other modules. One of the important modules is the ICMP (Network control Message) protocol.When an error occurs in transmitting an IP packet-such as a host unreachable, routing unreachable, and so on-the

From: http://blog.csdn.net/goodboy1881/article/details/670761 --------------------------------------------------------1. imcp Protocol Introduction As mentioned above, the IP protocol is not a reliable protocol. It does not guarantee that data is delivered. Naturally, the data delivery should be completed by other modules. An important module is the ICMP (Network Control Packet) protocol. When an error occurs when an IP packet is transmitted, such as

Crude CC attack-HTTP Flood HTTP Flood is an attack on Web Services in Layer 7 protocol.Hazard: Simple attack methods, difficult defense and filtering, and huge impact on hostsAttack method: HTTP Flood attacks do not need to control a large number of bots. Instead, they use port scanning programs to search for anonymous HTTP proxies or SOCKS proxies on the Interne

Algorithm 1 (Multi-border area, polygon direction, flood-fill, Floyd-warshall algorithm, short circuit problem 1) multi-layered AreaBytes The multidimensional representation of a pair (in reverse chronological order) is as follows: If the data is sorted by hour, you can obtain the hour number. For the multi-dimensional shapes described by the attention margin and the outer angle, the surface is as follows: The following n-grams of S = Σ [(-1)

ICMP backdoor (top) supplementalPrefaceIn the previous article Python3 implementation of the ICMP remote backdoor (above), I briefly explained the ICMP protocol, and the implementation of a simple ping function, after the article was published, a lot of friends backstage, saying that the calculation of the checksum is not very understanding, the implementation of

Python sends ICMP echo requesy request Copy Code code as follows: Import socket Import struct def checksum (source_string):sum = 0Countto = (len (source_string)/2) *2Count = 0While CountThisval = Ord (Source_string[count + 1]) *256 + ord (source_string[count))sum = sum + thisvalsum = sum 0xFFFFFFFFCount = Count + 2If Counttosum = sum + ord (Source_string[len (source_string)-1])sum = sum 0xFFFFFFFFsum = (sum >>) + (sum 0xffff)sum = s

1. ICMP (Internet Control message Protocol): Internet controlled message protocol. It transmits error messages and other information that needs attention.2. Application Scenario:1) Ping the program. The purpose of the ping is to test whether another host is available. The program sends an ICMP echo request message to the host and waits to return an ICMP echo repl

Software download for analysis: Wireshark-win32-1.10.2.exeRead the guided Tour1. Analyze and apply the ARP protocol2. Analyzing IP Protocols3. Analyzing the ICMP protocol1. Analysis of the format and content of ARP messages(1) The ARP request message of ping 172.18.3.132:000108000604000100e04c512ae8ac12038e000000000000ac120384Physical network Type hardware type:0001-ethernet (1)Protocol type Protocol TYPE:0800-IP (0x0800)Physical Address length hardwa

1. imcp Protocol Introduction As mentioned above, the IP protocol is not a reliable protocol. It does not guarantee that data is delivered. Naturally, the data delivery should be completed by other modules. An important module is the ICMP (Network Control Packet) protocol. When an error occurs when an IP packet is transmitted, such as host failure or route failure, the ICMP protocol packets the error inform

ICMP is considered a part of the IP layer, which transmits error messages and other information that requires attention. ICMP packets are often used by the IP layer or higher protocol (TCP/UDP) (some error messages are returned to the user process ). ICMP packets are transmitted inside IP datagram. For example, the format of