Linux Check network card real-time traffic __linux

Sar–n DEV 1 2

After the command 1 2 means: 1 times every second, 2 times.
Dev Display Network interface information
The-n parameter is useful, he has 6 different switches: DEV | Edev | NFS | NFSD | Sock | All.

DEV Displays network interface information,
EDEV displays statistical data about network errors,
NFS Statistics activity for NFS client information,
NFSD Statistics Server for NFS information,
Sock displays socket information,
All 5 switches are displayed. They can be used individually or together. Now we're going to use the-N dev.

Example:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20-21

# sar-n dev  1 2 Linux 2.6.32-358.el6.x86_64 (DB1)          03/21/2016&nbs p;      _x86_64_        (CPU)   10:29:58 AM      iface   rxpck/s    txpck/s     rxkb/s & nbsp;   txkb/s    rxcmp/s    txcmp/s   rxmcst/s 10:29:59 nbsp;      lo     16.00     16.00       0.77      0.77      0.00       0.00      0.00 10:29:59 am      eth0      48.00     31.00     20.06     15.77       0.00      0.00   &NBsp;  1.00 10:29:59 am      eth1    149.00    123.00     172.56    135.93      0.00       0.00      0.00 10:29:59 am      eth2       0.00      0.00      0.00       0.00      0.00      0.00      0.00   10:29:59 am     iface   rxpck/s    txpck/s      rxkb/s     txkb/s    rxcmp/s    txcmp/s   rxmcst/s