wireshark icmp

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

returned after the ping server receives the message.Here is the message format for request response: Let Wireshark start to grab the packet, with ICMP filter, open cmd window, enter ping www.youku.com, will find Wireshark start to crawl the message, ping default send 4 request message, all here will crawl to 8 messages (request and answer 4). Below you see a re

1. Test the machine, the source address IP is 10.21.28.110, the destination IP address is 10.6.0.24.2. Use IP.SRC = = 10.6.0.24 or IP.DST = = 10.6.0.24 filter rules to show only the data that 10.21.28.110 and 10.6.0.24 interact with.As shown, the ping command in Windows performs 4 ping programs by default, so Wireshark will catch 8 ICMP packets.3. Observe the first Echo (ping) request data frame that is num

, fill in the icmp packet, and fill in the sending time to the icmp data structure. Iii. icmp receiving code 1/** 2 * @ file icmp_recv.c 3 */4 5 # include Process: Create an ICMP-type original socket and receive it directly. First obtain the receiving time, and then extract the ip header,

Linux ICMP feature Analysis one ICMP protocol-related format 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

In the analysis of the previous section, 3 questions were left: Before parsing the ICMP packet processing process, I have the following questions: 1. Why to create a socket for each CPU only to send ICMP messages, do not use the socket can also send ICMP messages out. 2. What is the working principle of ping? 3. What is the working principle of traceroute? 1, for

　　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 function and characteristics of

Great ~~ BasicIo graphs: Io graphs is a very useful tool. The basic Wireshark Io graph displays the overall traffic in the packet capture file, usually in the unit of per second (number of packets or bytes ). By default, the x-axis interval is 1 second, And the y-axis is the number of packets at each time interval. To view the number of bits or bytes per second, click "unit" and select the desired content from the "Y axis" drop-down list. This is a ba

. That is to say, it notifies the client that the server has received the SYN packet, by adding a serial number of the original SYN Packet and using it as the response number, the client then knows that the server can receive communications. ACKMessage: The 8 th packet is the confirmation message sent from the client to the server, telling the Server Client to receive the SYN/ACK packet, and the client also adds the serial number as in the previous step. This packet is sent completely, the clien

First, ICMP introduction The full name of ICMP is the Internet Control message Protocol (inter-Network Messaging protocol), an integral part of IP, used to provide error reporting. Once the various types of errors are found to return them to the original host, our most common ping command is based on ICMP. |-----------------------------------------| || ------

Wireshark Data capture Teaching installation Wireshark installation WiresharkThe previous section of the study can be based on your own operating system to download the installation of Wireshark. This book has been developed 1.99.7 (Chinese version) mainly, the following describes the installation of Wireshark on Windo

Use ICMP tunneling technology for ICMP encapsulation and penetration Firewall 0x00 icmp Tunneling Technology ICMP tunneling technology, also known as Ping tunneling technology, we know that the ping protocol is icmp. When the firewall receives a protocol package, it is relea

Wireshark data packet capture tutorial-installing WiresharkWireshark data packet capture tutorial-install Wireshark learn how to download and install Wireshark based on your operating system in the previous section. This book focuses on the development version 1.99.7 (Chinese version). The following describes how to install W