Chuyển đến nội dung chính

[ iftop ] A Network Bandwidth Monitoring Tool for Linux


iftop is used to view the current bandwidth on a network interface. It listens to network traffic on a named interface and displays a table of current bandwidth usage by pairs of hosts. iftop must be run by a root user or a user who has sufficient privileges to monitor network bandwidths.
Installing iftop
On Debian/Ubuntu:
sk@sk:~$ sudo apt-get install iftop
On CentOS/RHEL:
iftop will not be found in official repositories. So let us add EPEL repository to install iftop:
[root@server ~]# rpm -ivh http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm
Now install it using the following command:
[root@server ~]# yum install iftop
Usage
iftop is very simple to use. Just type the iftop command on terminal with root privileges to display the bandwidth usage of the first network interface. Press Q to exit from the iftop command output.
[root@server ~]# iftop
root@server_001
To view the source and destination listening ports, just press SHIFT+S and SHIFT+D. It will display the traffic along with source and destination ports.
root@server_007
To view the network bandwidth of a particular interface, use the following command.
[root@server ~]# iftop -i eth0
root@server_002
By default, iftop will display all traffic in kilo/mega/giga bits per second. To display all traffic in bytes instead of bits the parameter -B (Capital B).
[root@server ~]# iftop -i eth0 -B
root@server_003
To display the traffic on which port is occurring, use -P and -N switches with iftop command.
[root@server ~]# iftop -i eth0 -P -N
The parameter -N displays the port number.
root@server_004
To view the in and out packet flowing of a network, use the following command.
 [root@server ~]# iftop -F 192.168.1.0/24
For more information about iftop command, refer the man pages using the following command:


[root@server ~]# man iftop
Nhãn:

Nhận xét

Đăng nhận xét

Bài đăng phổ biến từ blog này

Fake WiFi Access Point

Evil Twin Methodology Step 1 : We will first scan the air for a target access point. Then create an access point using airbase-ng with the same name and channel of the target access point, hence Evil- TWIN. Step 2 :The client is now disconnected repeatedly from the  original access point and as most modern system’s setting says… “Connect back to same ESSID(AP name) if disconnects”. This also happens because when the client disconnects from any access point it starts sending  probe requests  in the air with the name of the access point it connected to earlier. Hence  BSSID  isn’t a barrier, you just need  ESSID  to spoof the AP Step 3 : Clients is now connected to the Fake WiFi access point and now client may start browsing Internet. Step 4 : Client will see a web administrator warning saying “Enter WPA password to download and upgrade the router firmware” Step 5 : The moment client enters the password, s/he will be redirected to a loading ...
Đăng nhận xét
Đọc thêm

Hướng dẫn reset máy in brother 2701dw

Mở nắp cửa tháo hộp mực máy in ra, cụm cartridge gồm 2 phần : cụm trống và cụm mực. Dùng tuốc-nơ-vít 4 cạnh vặn 2 con ốc tháo cụm bánh răng reset ra ( 2 con ốc nằm ở bên phía bánh răng ), bên phía bánh răng có 3 con ốc thì văn 2 con ra. Tháo cụm cartridge ra chúng ta để ý vị trí của  nẫy nhựa màu trắng  ở vị trí bên trái của cung tròn. Tháo được cụm bánh răng reset ra ( hình ảnh ) Bánh răng reset là bánh răng có gắn lò xo ở phía trên. Tháo rời các bánh răng ra Nắp nhựa màu đen ( khoanh đỏ ) bạn dùng tua-vít 2 cạnh bẩy cái nắp ra để đổ mực vào trong sau đó nắp lại như cũ ( để ý không làm gãy hoặc méo trục nhựa màu đen để ráp bánh răng vào ). Để ý khi máy in báo : “ tonner empty ”  trên màn hình   nghĩa là máy đã hết mực.   Đổ mực xong chúng ra lắp bánh răng như hình dưới để reset : Bánh răng bên cạnh cũng phải đúng vị trí. vấu nhựa ...
Đăng nhận xét
Đọc thêm

Steps to Configure your Zoho Account as POP in Outlook

Enable POP  in the Zoho Mail interface. Launch Outlook application in your system.  From the menu, browse to Tools » Account Settings » Email Accounts » Email tab Click New to open ‘ Add new email account ’ window. In Add New Account settings page, Select ‘ Manually configure Server settings or Additional Server Types ’ » Click Next Select Internet Email in the page that appears and Click Next to input the User Information.  User Information Your Name – Preferred Display Name E-mail Address – Provide your Zoho Account Email Address Account Type – Select POP3 for enabling POP Server Information for Organization users Incoming mail Server –  poppro.zoho.com Outgoing mail Server –  smtp.zoho.com User name –   you@yourdomain.com  (Your Zoho Account Email Address) Password – Zoho Account Password. Note: Provide Application Specific Password, if your account is TFA enabled.  Server Information for Personal users Incoming mai...
Đăng nhận xét
Đọc thêm