vpn icmp

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

Tags: icmp tcpip Wireshark Network Type code type description 0 response (echo-reply) 3 inaccessible 4. Source Suppression 5 redirection 8. Response Request) 11 timeout 12 parameter failure 13. Timestamp Request 14 timestamp response 15. Information Request (* expired) 16. Information Response (* expired) 17. Address Mask Request 18 Address Mask response View with Wireshark Appendix: 几种常见的ICMP报文： 1.响应

The ICMP protocol is unclear. Next we will briefly introduce some of the content of this Protocol. ICMP (Internet Control Message Protocol)-Internet Control Message Protocol. ICMP is mainly used for the construction of error information and control information and the acquisition of some network information. ICMP and I

In ICMP applications, we can use the ping command to perform operations. This article introduces the application of this Part. Describes the specific implementation code. I hope it will help you learn ICMP. Principles: This example demonstrates the application of Microsoft ICMP. DLL "ping" another machine. this DLL is an API interface for sending

In some ICMP applications, we will find some ICMP error response problems. How can this problem be solved? Here we will introduce the specific content of Sniffer packet capture to analyze ICMP error responses. An unopened port from 192.168.1.2telnet192.168.1.1 The returned port cannot reach the ICMP error and data fr

ICMP and IGMP protocols are the basic protocols in the tcp ip protocol stack. Therefore, message control is the main task of ICMP. For IGMP, the main task is to pass the information to the router. Let's take a look at the specific explanations of the two protocols below. Internet Control Message Protocol ICMP is used to report errors and control messages on beha

ICMP (Internet Control Packet Protocol) To forward IP data packets more effectively and improve the chances of successful delivery, the network layer uses the Internet Control Packet protocol ICMP. ICMP acts as the IP datagram data and adds the header of the datagram to form the IP datagram forwarding. ICMP allows th

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

The ping-based ICMP backdoor that was inadvertently seen while searching. So to the author's GitHub to see, incredibly is engraved, in order to level, can only endure to see, the student dog hurt. Fortunately it's easier to understand, as the introduction says: "PRISM is a user space stealth reverse shell backdoor, written in pure C."Project address:https://github.com/andreafabrizi/prismPrism has only two main files, simple configuration, can be run o

Visio OS opera linux ieCisco Systems IOS is vulnerable to a denial-of-service attack using ICMPRedirect messages.When flooded with ICMP redirect messages, the IOS uses up all its memoryTo store the new host routes. The device is then unable to performOperations that need additional memory such as processing ing routing updatesAnd accepting inbound telnet (1) connections.DETAILSKnown vulnerable combinations:* Cisco 1005 with IOS 11.0 (18)* Cisco 1603 w

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