实时监控网卡流量的命令

1、sar -n DEV 2 0

sar命令详解：
-n { DEV | EDEV | NFS | NFSD | SOCK | ALL }
Report network statistics.

With the DEV keyword, statistics from the network devices are reported. The
following values are displayed:

IFACE
Name of the network interface for which statistics are reported.

rxpck/s
Total number of packets received per second.

txpck/s
Total number of packets transmitted per second.

rxbyt/s
Total number of bytes received per second.

txbyt/s
Total number of bytes transmitted per second.

rxcmp/s
Number of compressed packets received per second (for cslip etc.).

txcmp/s
Number of compressed packets transmitted per second.

rxmcst/s
Number of multicast packets received per second.

2、watch ifconfig 网卡