Use the iftop command in Linux to view server traffic
Introduction
Iftop is similar to the top real-time traffic monitoring tool in Linux.
Iftop can be used to monitor the network card's real-time traffic (network segment can be specified), reverse resolution IP address, display port information, and so on. The detailed description will be described in the following parameters.
Install
# Yum install-y iftop
Run
# Iftop
Interface Description
Interface header:
Traffic scale, corresponding to the White horizontal bar of each row below.
Central interface:
The server is displayed on the left, the Internet IP is in the middle, the inbound arrow on the left, and the outbound arrow on the right. The traffic on the right is 2 s, 10 s, and 40 s.
Interface bottom:
TX: Send traffic
RX: receive traffic
TOTAL: TOTAL traffic
Cumm: total traffic from running iftop to current time
Peak: traffic peak
Rates: average traffic in the past 2 s, 10 s, and 40 s respectively
Command Parameters
- -I: sets the monitored Nic, for example: # iftop-I eth1
- -B displays traffic in bytes (bits by default), for example: # iftop-B
- -N: the host information is directly displayed by default, for example: # iftop-n
- -N indicates that port information is directly displayed by default, for example: # iftop-N
- -F displays inbound and outbound traffic for a specific network segment, for example, # iftop-F 192.168.1.0/24 or # iftop-F 192.168.1.0/255.255.255.0
- -H (display thismessage), help, display parameter information
- -P: When this parameter is used, the local host information is displayed in the intermediate list, and IP information other than the local host is displayed;
- -B: The traffic graph bar is displayed by default;
- -F this is not very useful for the moment. It is used to filter the computing package;
- -P: the host information and port information are displayed by default;
- -M: specifies the maximum value of the scale at the top of the page. The scale is displayed in five segments. For example, you can run this command # iftop-m 1 M
Interface commands
- Switch by h to see if the help is displayed;
- Switch by n to display the local IP address or host name;
- Switch by s to check whether the host information of the local machine is displayed;
- Switch by d to whether the host information of the remote target host is displayed;
- The display format of switching by t is 2 rows/1 line/only show sent traffic/only show received traffic;
- Switch by N to display the port number or port service name;
- Switch by S to check whether the port information of the local machine is displayed;
- Whether to display the port information of the remote target host based on D;
- Switch by p to see whether port information is displayed;
- Press P to switch to pause/continue display;
- Switch by B to see whether the average traffic graph is displayed;
- Calculate the average traffic of 2 seconds, 10 seconds, or 40 seconds based on B switching;
- Whether to display the total traffic of each connection during T-based switchover;
- Press l to enable the screen filtering function. Enter the characters to filter, such as ip address. Press enter to display only traffic information related to this IP address;
- Switch the scale on the top of the display screen by L; the traffic graph bar varies depending on the scale;
- Press j or k to scroll up or down the connection records displayed on the screen;
- You can sort the data by 1, 2, or 3 based on the traffic data in the three columns displayed on the right;
- Sort by <according to the local name or IP address on the left;
- Sort by> by the host name or IP address of the remote target host;
- Whether o-based switchover is fixed only displays the current connection;
- Press f to edit and filter the Code. This is a translation, and I have never used this!
- Press! You can use shell commands. This is useless! I don't understand what the command works here!
- Press q to exit monitoring.
Install iftop in CentOS
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