icmp monitoring

The full name of ICMP is Internet control and message protocal, which is the Internet Control Message/error message protocol. It works at the network layer and is a communication protocol for IP addresses, the main purpose is to report errors and status messages between hosts and devices on the network. The most common ICMP application is ICMP response request, t

[Network layer] Analysis Network Layer-Internet Control Packet Protocol ICMP (Internet Control Message Protocol) 1) Message format: the ICMP packet is encapsulated into the data part of the IP packet, and the data part of the ICMP packet is the first eight bytes (IP address and port number) of the IP header and data part of the IP datagram to report errors 2)

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

The most characteristic of ICMP protocol is the nature of ICMP flood. In this regard, we will give a detailed introduction. See what forms of ICMP flood are available. Below are some simple examples to help you analyze them. ICMP flood in different ways 1. Direct ICMP flood

ICMP protocol principlesAbout ICMP For those familiar with the network, ICMP is no longer familiar. It works in the network layer of the ISO model like the IP protocol, and its full name is Internet Control Message Protocal. Its main role in the network is:-Host detection-Route maintenance-Route Selection-Traffic ControlThere are many methods for host detection:

Use Wireshark to analyze ICMP Packets ICMP protocol Introduction 1. ICMP is the abbreviation of "Internet Control Message Protocol" (Internet Control Message Protocol. It is a sub-Protocol of the TCP/IP protocol family. It is used to transmit control messages between IP hosts and routers. A message control refers to a message of the network itself, such as networ

Icmp:internet Control Message Protocol 　　 ICMP is a sub-protocol of the TCP/IP protocol family that is used to pass control messages between IP hosts and routers. The control message refers to the message that the network is not accessible, whether the host is available, whether the route is available, and so on.The ICMP protocol is sent by IP protocol, which is a kind of non-connected and unreliable packet

Dpkt tutorial #1: ICMP echo In this dpkt tutorial, I will demonstrate how to construct and send a simple ICMP ECHO packet. Dpkt is a sweet framework for creating and parsing packets. while dpkt doesn' t have much documentation, once you get the hang of using one module, the rest fall into place fairly easily. i'll be doing a number of dpkt tutorials with simple tasks in hopes of providing some "documentatio

There is a monitoring host in Dongguan to Beijing, the problem of BGP; alarm SMS sent frantically; find Dongguan IDC and Beijing BGP service Provider assistant investigation;There is a strange problem; Beijing to Dongguan Trcaceroute have routing informationDongguan 143 to Beijing there is no routing information; but, Dongguan 151 to Beijing there is routing information;Check the iptables configuration for 143 and 151 segments, and find subtle differe

At the network layer, ICMP plays an important role. It can be regarded as a reviewer and helps us check some transmission problems in messages. Then we will standardize the definition of this Protocol. Internet Control Message Protocol (ICMP) is used to send Control messages in a TCP/IP network and provide feedback on problems that may occur in the communication environment, with this information, managers

The weather is good today. Internet Control Information Protocol (ICMP)The structure belongs to the transport layer, but it actually belongs to the network layer and is part of the IP layer. The ICMP protocol provides routing and transfer error reports for IP datagram during transmission. ICMP messages are sent in the following situations: when the datagram canno

ICMP backdoorObjectiveFirst: Python3 implementation of the ICMP remote Control back door (upper)The second article: Python3 implementation of the ICMP remote control back door (top) _ supplementary articleArticle Three: Python3 realization of the ICMP remote control back door (Central) "sniff" black technologyLast arti

This method solves the problem of a master that is not linked to salt minion. Http://www.cnblogs.com/sammyliu/p/4981194.html Network error location case ICMP Host * * * Unreachable-admin prohibited 1. Environmental A physical server 9.115.251.86, which creates two virtual machines, two network cards per virtual machine: vm1:eth0-9.*.*.232 eth1:10.0.0.14 vm2:eth0-9.8.*.219 eth1 : 10.0.0.10, running DHCP Agent, managing DNSMASQ, providing DHCP service