linux sniff network traffic

There is a lot of information about TCP IP network traffic, and TCP IP is communicating end-to-end through IP packet mode. A typical TCP packet is as followsYou can see that the packet contains the source port number and the destination port number, when the client socket initiates a connection to the server, the system will randomly assign a source port number to the socket, and we can obtain the original

The script for viewing Nic traffic in Linux (modified perfectly) Fixed the problem where a negative number is displayed.Added bits/s statisticsAdded the final average sum.#! /Bin/bash# Osdba 2008.10.22 monitor the interface's network traffic.# Zeuslion 2009.08.29.If [$ #-ne 3]; thenEcho useage: $0 interface interval c

Article Title: Linux server site traffic limit solution. Linux is a technology channel of the IT lab in China. Includes basic categories such as desktop applications, Linux system management, kernel research, embedded systems, and open source. #! /Bin/sh # Simple bandwidth limiter- # Change this to your link bandwidth

This article may be helpful if you think that a gigabit Nic on an intranet server cannot meet your switching needs.In fact, I have never thought about writing this article before, because I had an interview with a well-known domestic video website two days ago. I had the following question: "I will give you a server with four Gigabit NICs, how can I achieve the maximum 4G traffic output?" At that time, I did not think much about completing the job. Af

Sometimes we need to look at the network card traffic on the server in real time, here I write a shell script. The script uses a while true "dead loop", every 10s from "/proc/net/dev" to take a value and calculates the average bandwidth within 10s based on the difference within 10s; Press CTRL + C to stop execution. Scripts are compatible with CENTOS6 and 7, the scripts are not too complex, and the annotati

1, view the host network card traffic The code is as follows Copy Code #!/bin/bash#!/bin/bash#network#Mike. XuWhile:; TodoTime= ' Date +%m '-"%d" "%k": "%m"day= ' Date +%m '-'%d 'Rx_before= ' ifconfig eth0|sed-n "8" P|awk ' {print $} ' |cut-c7-'Tx_before= ' ifconfig eth0|sed-n "8" P|awk ' {print $} ' |cut-c7-'Sleep 2Rx_after= ' ifconf

0.000 kb/sec? Root. 92:80-192.168.25.57:47865 0.000 0.000 kb/sec? Root. 92:80-192.168.25.99:60505 0.000 0.000 kb/sec? Root. 99:52048-192.168.20.94:80 0.000 0.000 kb/sec? Root. 57:54916-192.168.20.94:80 0.000 0.000 kb/sec? Root. 2335-192.168.25.118:10050 0.000 0.000 kb/sec? Root. 2334-192.168.25.118:10050 0.000 0.000 kb/sec? Root. 2333-192.168.25.118:10050 0.000 0.000 kb/sec? Root. 2332-192.168.25.118:10050 0.000 0.000 kb/secThis article is from the "Boyhack" blog, make sure to keep this source

Network monitoring tools are an important feature for businesses of any size. The objectives of network monitoring may vary widely. For example, the goal of monitoring activities can be to ensure long-term network services, security protection, performance troubleshooting, Network usage statistics. Because of its diffe

the physical network card, which can improve the bandwidth and network stability After we have a number of physical network card binding to a logical network card, our IP address is required to be configured on this logical network card, rather than multiple physical

tools capture separate packages on the link, analyze their content, and display decoded content or packet-level statistics. These tools monitor and manage the network at the lowest level, as well as the most granular monitoring, at the expense of the process of affecting network I/O and analysis.Dhcpdump: A command-line DHCP traffic sniffing tool that captures D

Linux entry notes: 14. Network basics and linux Network BasicsI. IP Address An IP address is a globally unique identifier of each network node on the Internet. an IP address uniquely identifies a host (strictly speaking, it identifies a