linux trace network traffic

"51CTO Featured Translations" This article describes some of the Linux command-line tools that you can use to monitor network usage. These tools can monitor data transmitted over a network interface and measure the speed at which data is being transmitted. The inbound traffic is displayed separately from the outbound t

Diagnose network problems in Linux Kernel A few weeks ago, we began to pay attention to the great changes in the network traffic of servers that track API in Washington. In a fairly stable daily model, we start to see 300-400 Mbps peak traffic, but our legitimate

port N2 //capture traffic on multiple ports 3 # tcpdump-w Output.pcap //Data Package dump, keep the original packet to OUTPUT.PCAP4 # tcpdump-c 10-w output.pcap //Limit the upper limit of each dump file, and the file will be divided (in megabytes) after the limit is reached 5 # tcpdump-c 10-w 5-w out Put.pcap //Not only limits the upper limit per volume, but also limits the total number of volumes 6 # Tcpdump-r Output.pcap //Replay sav

Original: http://zhumeng8337797.blog.163.com/blog/static/1007689142011643834429/First install the network card, even on the network cable, this is nonsense, needless to say.and start!Set up Linux let the bridge run Configure the bridgeWe need to let Linux know the bridge, first tell it, we want a virtual Ethernet Bridg

indicates the carrier error rate; rxfram/s frame arrangement error; rxfifo/s accept FIFO error; txfifo/s send FIFO error. The above output shows that all kinds of errors are zero, which proves that the network works well. Linux performance monitoring is generally used to monitor network performance. Here are the following points: 1. Check all

How to limit network bandwidth in Linux If you often run multiple network applications on the Linux desktop or share bandwidth with multiple computers at home, you may want to better control the bandwidth usage. Otherwise, when you download a large file using the download tool, the interactive SSH session may become sl

Article title: Linux security strategy server and network equipment maintenance. 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. At present, many small and medium users are constant

Linux Advanced Programming --BSD Socket of network programmingTenet: The learning of technology is limited and the spirit of sharing is limitless.a Fundamentals of network communicationTCP/IP Protocol Cluster Foundation: TCP/IP is a protocol cluster because TCP/IP includes TCP, IPS, UDP, ICMP, and many other protocols. is the OSI model and the TCP/IP model, TCP/

Now it's time to put all of the previous theoretical knowledge into practice. Next, we will explore: ? Configuration file for network interface in Red Hat 7 ? Using Ifconfig to check and configure interfaces ? Adding and editing static routes ? Using Netstat to monitor/troubleshoot network interfaces A Key files and scriptsThe actual process of network interface

Guide The most important and basic Linux Network command collection that aspiring Linux system administrators and Linux enthusiasts must know. At It's FOSS we are not talking about the "command line aspect" of Linux every day. Basically, I'm more focused on the desktop

Basic Linux Network commands, you deserveGuideAmbitious Linux system administrators and Linux enthusiasts must know the most important and basic collection of Linux Network commands. In It's FOSS, we don't talk about Linux's "comm

Use sysctl the command to temporarily turn on the kernel's packet forwarding Use the command to do the temporary configuration of the network, to do a permanent configuration will need to directly modify the way the file!Common tools for network detection: Ifconfig Detecting Network Interface Configuration Route Detection Routing Configurat

Article title: Tcpdump command usage and example-linux network analysis. 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. As the name suggests, TcpDump can completely intercept the "

variable in Linux, representing the time. Its unit varies with the hardware platform.A constant Hz is defined in the system, representing the number of minimum time intervals per second. In this way, the unit of jiffiesIt is 1/Hz. Jiffies on Intel is measured in 1/100 seconds, which is the minimum time that can be distinguished by the system.Interval. Therefore, expires/Hz is the cycle of the clock in seconds.Function is the callback function after t

' ENP0S3 '. Successfully activated connection (D-bus activation path:/ORG/FREEDESKTOP/NETWORKMANAGER/ACTIVECONNECTION/3) [[emailprotected] network-scripts]# Ifconfigenp0s3:flags=4163Temporarily modify the hostname hostname hostname, permanently modify the Linux hostname Vim/etc/hostname, restart, or source/etc/profile reload the system environment variable fileDNS profile:/etc/resolv.conf The DNS file prio

the network interface, traffic and more properties.2. Use the hostname command-view host nameIn a Linux system, a considerable portion of the network services are identified by the host name of the machine, if the hostname is improperly configured, may cause program function failure. Use the hostname command to view t

or 10 seconds or 40 seconds is calculated by B switch;Press T to toggle whether the total traffic for each connection is displayed;Press L to turn on the screen filtering function, enter the characters to filter, such as IP, press ENTER, the screen will only show this IP-related traffic information;Press L to toggle the scale on the top of the display screen, and the flow graph bar will change depending on

View network ConfigurationIfconfig command: View active network Interface Device informationIfconfig eth*: View specified network interface device informationIf eth0 represents the first Ethernet card; eth1 represents the second Ethernet card;Hostname command: View host nameRoute command: View route table entry-N Displays the address in the routing record as a di

First, the Linux system networking settingsAfter we installed the Linux system, the first is to configure the network services, after all, if the computer is not networked it is a calculator. When configuring network functions, it is simple and quick to start with the dhclient command (

(CPU execution Time), the proportion of time spent by the three is about 250: 30: 1, which is based on the packet size of bytes. The larger the ratio of the three, the longer the transmission (or receipt) and DMA packets are the time bottlenecks. During interrupt processing, it takes a little longer to "New packets arrive" than "packet transfer completed. Keywords: Linux, Protocol driver, network card driv