Shulou(Shulou.com)06/01 Report--

This article mainly introduces how to quickly get started with Iftop commands in linux, which is very detailed and has certain reference value. Friends who are interested must finish reading it!

The basic usage of Iftop

Run the iftop command without any parameters to view the bandwidth usage of the default interface, as shown in the screenshot below.

$sudo iftop

An example of the output of the iftop command shows the bandwidth of the default interface, as shown below.

Real-time monitoring of Linux network bandwidth

Real-time monitoring of Linux network bandwidth

Parameters commonly used in Iftop parameters

-I set the network card for monitoring, such as # iftop-I eth2

-B displays traffic in bytes (default is bits), such as # iftop-B

-n causes host information to display IP directly by default, such as # iftop-n

-N causes port information to display port number directly by default, such as # iftop-N

-F shows the inbound and outbound traffic of a specific network segment, such as # iftop-F 10.10.1.0 Universe 24 or # iftop-F 10.10.1.0 Universe 255.255.255.0

-h (display this message), help, display parameter information

-p after using this parameter, the list in the middle shows the local host information and IP information other than the local host appears.

-b to make the traffic graph bar display by default

-f this is not very good at using for the time being, it is used to filter and calculate packets.

-P makes host information and port information display by default

-m sets the maximum value of the scale at the top of the interface, which is displayed in five segments, for example: # iftop-m 100m

Some operation commands after entering the iftop screen (pay attention to case)

Press h to toggle whether to display help

Press n to toggle to display the IP or hostname of this machine

Press s to switch whether to display the host information of this computer.

Press d to toggle whether to display the host information of the remote target host

Toggle the display format by t to 2 lines / 1 lines / only send traffic / only received traffic

Press N to toggle to display the port number or port service name

Press S to toggle whether to display the port information of this machine.

Press D to toggle whether to display the port information of the remote target host

Press p to toggle whether to display port information

Press P to toggle pause / resume display

Press b to toggle whether to display the average flow graph bar

Calculate the average traffic within 2 seconds or 10 seconds or 40 seconds by B switch

Press T to toggle whether to display the total traffic for each connection

Press l to open the screen filtering function, and enter the characters to be filtered, such as ip. After pressing enter, the screen will only display the traffic information related to this IP.

Press L to switch the scale on the display screen; if the scale is different, the flow graph bar will change

Press j or k to scroll up or down the connection record displayed on the screen

Press 1 or 2 or 3 to sort according to the three columns of traffic data displayed on the right

Press

Press > to sort by the hostname or IP of the remote destination host

Press o to toggle whether to display only the current connection

Press f to edit the filter code, this is a translated statement, I have not used this!

Press! You can use the shell command, this is not used! I don't understand what orders work here!

Press Q to exit the monitoring.

Monitoring Linux network interface

First run the following ifconfig command or ip command to find all connected network interfaces on the Linux system.

$sudo ifconfigOR$ sudo ip addr show

Then use the-I flag to specify the interface to monitor. For example, the following command is used to monitor the bandwidth on the wireless interface on the test computer.

$sudo iftop-I wlp2s0 monitors Linux Wifi network bandwidth

Monitor Linux Wifi network bandwidth

To disable hostname lookup, use the-n flag.

$sudo iftop-n eth0

To turn on the port display, use the-P switch.

$sudo iftop-P eth0Iftop options and usage

When running iftop, you can use keys such as S, D to view more information, such as source, destination, and so on. If you want to explore more options and techniques, run iftop. Press "Q" to exit the running window.

The above is all the contents of the article "how to get started with Iftop commands in linux". Thank you for reading! Hope to share the content to help you, more related knowledge, welcome to follow the industry information channel!

Welcome to subscribe "Shulou Technology Information " to get latest news, interesting things and hot topics in the IT industry, and controls the hottest and latest Internet news, technology news and IT industry trends.