python icmp

ICMP: Internet Control Message Protocol. The network layer of the Internet consists of the IP protocol, the routing protocol (RIP, OSPF, BGP), and ICMP. ICMP is used to exchange messages between the host and the route. The most typical is used to report errors. ICMP data is transmitted as valid data in IP data packets

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

What is icmp redirection ICMP redirection is one of the ICMP control packets. Under certain circumstances, when a router detects that a machine uses a non-optimized route, it will send an ICMP redirection packet to the host and request the host to change the route. The router also forwards the initial datagram to its d

In ICMP applications, network attacks have always been the focus of our attention. I believe that every administrator will not relax in this regard. So what are the characteristics of the protocol attacks? How can we prevent it? The following is a detailed analysis. ICMP attacks Although the ICMP protocol gives hackers the opportunity,

Recently, in the server (System CentOS 6.8 x64) Risk assessment detection, the following low-risk vulnerability, although the risk is low, but look is uncomfortable. Long-term engaged in it work, the total pursuit of perfection 650) this.width=650; "alt=" I_f03.gif "src=" Http://img.baidu.com/hi/face/i_f03.gif "/>.650) this.width=650; "title=" bug.jpg "alt=" wkiom1gtg-uqurq0aaau89ggqz0303.jpg "src=" http://s1.51cto.com/wyfs02/M02 /8a/57/wkiom1gtg-uqurq0aaau89ggqz0303.jpg "/>Vulnerability Descrip

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

Author: Yi shoulong 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

There are three main types of network attacks by using ICMP Packets: Death Ping, ICMP DoS attacks, and redirection-based route spoofing. I. Death Ping 1.1 attack principle-limits the length of Ethernet packets, ultra-large packet networks adopt multipart transmission. The first part after a packet is split only contains the length of each part. The receiving end reassembles the received part message. The to

Preface Java is a cross-platform language. Generally, network operations are performed at or above the IP layer, that is, only tcp/udp operations can be performed. Of course, you can also set some options for tcp/udp, if you want to perform operations on the IP layer or data link layer, you can do nothing. You must rely on jni to use the socket interfaces of the local OS. Fortunately, I know that someone is developing jpcap when I know winpcap. This package allows you to conveniently operate the

The common ICMP packet Echo is the consulting information. The ping command uses this type of ICMP packet. When the ping command is used, an ICMP packet of the Echo-query type will be sent to the target host, and after the target host receives the ICMP packet, the Echo-response type

ICMP protocolIP does not provide a reliable transport service, nor does it provide end-to-end or point-to-point acknowledgement, which is implemented in the IP module if an error can be seen through the ICMP report. The TCP/IP protocol designs ICMP to compensate for the lack of IP protocol.It is a sub-protocol of the TCP/IP protocol family for use in IP hosts. Ro

The ICMP packet sent from client C to server s is intercepted when it passes through the local p. The previous article describes how to obtain the original destination address. You must forward the data to the original destination address S, and forward the response from the original destination address to the client. To implement transparent proxy, the source address of the ICMP response you return to the

Internet Control Information Protocol (ICMP)　IntroducedIn a system called Catenet, the IP protocol is used as a host to the host datagram service. A network connection device is called a gateway. These gateways exchange information for control through gateways to Gateway protocols (GGP). Typically, a gateway or destination host communicates with the source host, for example, for reporting errors in the datagram process.

The ICMP protocol is a very important protocol in the network layer, it is called the Internet Control Message Protocol (Internet controlling messaging Protocol), the ICMP protocol makes up the lack of IP, it uses IP protocol to transmit information, Provide error information feedback to the source node in the packet that occurs at the network layer. The ICMP hea

ICMP Internet Control Message Protocolis generally considered an integral part of the IP layer and is generally used by the IP layer or higher (TCP, UDP).The ICMP message is transmitted inside the IP datagram.The format of the ICMP message is as follows:The first 4 bytes of the message are the same: 8bit type, 8bit code, 16bit test and.The