netstat - Print network connections, routing tables, interface statistics, masquerade connections, and multicast memberships

netstat

—interfaces, -i Display a table of all network interfaces.

netstat -i
Kernel Interface table
Iface   MTU Met   RX-OK RX-ERR RX-DRP RX-OVR    TX-OK TX-ERR TX-DRP TX-OVR Flg
eth0   1500 0    121662      0      0 0          2058      0      0      0 BMRU
lo    16436 0         8      0      0 0             8      0      0      0 LRU

Iface: Interface

link-layer: MTU: 最大传输单元 in byte

RX-OK/TX-OK: 正确传输了多少数据包： RX-ERR/TX-ERR: 错误 RX-DRP/TX-DRP: 丢弃 RX-OVR/TX-OVR: 误差

以上各值如果不为0并且很大，网络质量有问题， 1. 查看网卡设备故障 2. 检查网络部署 3. 升级千兆网卡和光纤网络。

Flg:

• L: loop device
• U: in active state
• O: disable arp
• P: point to point connection
• B: broadcast
• M: receive all the data package
• R: running

如果网络异常，首先需要监测路由表：

justin@Justin:~/projects/linux/gst-plugins$ netstat -r
Kernel IP routing table
Destination     Gateway         Genmask         Flags   MSS Window  irtt Iface
10.194.44.0     *               255.255.254.0   U         0 0          0 eth0
default         gateway10-194-4 0.0.0.0         UG        0 0          0 eth0

和 sudo route 输出相同

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