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vnStat is a console-based network traffic monitor for Linux and BSD that keeps a log of network traffic for the selected interface(s). It uses the network interface statistics provided by the kernel as information source. This means that vnstat won’t actually be sniffing any traffic and also ensures light use of system resources. However, in Linux at least a 2.2 series kernel is required.
It is very simple to install and use. It can monitor multiple network interfaces at the same time. It will display the output summary in hourly, daily, weekly and as well as monthly basis. And it can be used without root permissions.

Install vnstat
On Debian/Ubuntu:

 

1	user@centriohost# sudo apt-get install vnstat

On RHEL/CentOS:
vnstat will not be found in Official repositories, so add EPEL repository to install vnstat:

 

1	[root@server ~]# rpm -ivh http://dl.fedoraproject.org/pub/epel/6/i386/epel-release-6-8.noarch.rpm

Install vnstat with following command:

 

1	[root@server ~]# yum install vnstat -y

Usage
To view all network interfaces statistics, enter the following command:

 

1	user@centriohost# vnstat

This shows network bandwidth usage of all network interfaces:

 

rx      /      tx      /     total    /   estimated eth1:        Jul '13      4.77 MiB  /     204 KiB  /    4.97 MiB  /       0 KiB        today      4.77 MiB  /     204 KiB  /    4.97 MiB  /      --       wlan0: Not enough data available yet. eth0: Not enough data available yet.

To view a particular interface bandwidth usage, enter the command:

 

1	user@centriohost# vnstat -i eth1

The above command will display the bandwidth usage of eth1:

 

Database updated: Thu Jul  4 13:26:10 2013    eth1 since 07/04/13           rx:  4.82 MiB      tx:  249 KiB      total:  5.07 MiB    monthly                      rx      |     tx      |    total    |   avg. rate      ------------------------+-------------+-------------+---------------        Jul '13      4.82 MiB |     249 KiB |    5.07 MiB |    0.13 kbit/s      ------------------------+-------------+-------------+---------------      estimated        --     |      --     |      --     |      daily                      rx      |     tx      |    total    |   avg. rate      ------------------------+-------------+-------------+---------------          today      4.82 MiB |     249 KiB |    5.07 MiB |    0.86 kbit/s      ------------------------+-------------+-------------+---------------      estimated        --     |      --     |      --     |

To view the hourly usage, use the parameter “-h” without quotes:

 

user@centriohost# vnstat -i eth1 -h eth1                                                                  13:31   ^                                                                      r       |                                                                       r       |                                                                       r       |                                                                       r       |                                                                       r       |                                                                       r       |                                                                       r       |                                                                       r       |                                                                       r       |                                                                       r     -+--------------------------------------------------------------------------->   |  14 15 16 17 18 19 20 21 22 23 00 01 02 03 04 05 06 07 08 09 10 11 12 13 h  rx (KiB)   tx (KiB)      h  rx (KiB)   tx (KiB)      h  rx (KiB)   tx (KiB) 14          0          0    22          0          0    06          0          0 15          0          0    23          0          0    07          0          0 16          0          0    00          0          0    08          0          0 17          0          0    01          0          0    09          0          0 18          0          0    02          0          0    10          0          0 19          0          0    03          0          0    11          0          0 20          0          0    04          0          0    12          0          0 21          0          0    05          0          0    13       4964        290

To view daily usage, use the parameter “-d”:

 

user@centriohostt# vnstat -i eth1 -d   eth1  /  daily          day         rx      |     tx      |    total    |   avg. rate      ------------------------+-------------+-------------+---------------       07/04/13      4.82 MiB |     249 KiB |    5.07 MiB |    0.86 kbit/s      ------------------------+-------------+-------------+---------------      estimated        --     |      --     |      --     |

To view weekly usage, use the parameter “-w”:

 

user@centriohostt# vnstat -i eth1 -w   eth1  /  weekly                       rx      |     tx      |    total    |   avg. rate    ---------------------------+-------------+-------------+---------------     last 7 days      4.85 MiB |     290 KiB |    5.13 MiB |    0.07 kbit/s    current week      4.85 MiB |     290 KiB |    5.13 MiB |    0.14 kbit/s    ---------------------------+-------------+-------------+------