查看网卡信息及状态和网卡日志信息

查看网卡信息
1-mii-tool [-v/w] em1/em2/l0
em1: negotiated 100baseTx-FD, link ok
product info: vendor 00:aa:00, model 57 rev 1
basic mode: autonegotiation enabled
basic status: autonegotiation complete, link ok
capabilities: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD
advertising: 1000baseT-FD 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control
link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

mii-tool工具一定要指定网卡，不能查全部。

2- ifconfig /ifconfig -a
eth0 Link encap:Ethernet HWaddr
00:09:6B:09:08:FC
inet addr:192.168.10.1 Bcast:192.168.10.255
Mask:255.255.255.0
inet6 addr: fe80::209:6bff:fe09:8fc/64 Scope:Link
UP BROADCAST RUNNING MULTICAST MTU:1500
Metric:1
RX packets:106732953 errors:0 dropped:0 overruns:0
frame:0
TX packets:104379788 errors:0 dropped:0 overruns:0
carrier:0
collisions:0 txqueuelen:100
RX bytes:2351331877 (2.1 GiB) TX bytes:391707945 (373.5
MiB)
Base address:0x2500
Memory:fbfe0000-fc000000
eth1 Link
encap:Ethernet HWaddr 00:09:6B:09:08:FD
BROADCAST
MULTICAST MTU:1500 Metric:1
RX packets:0 errors:0 dropped:0 overruns:0 frame:0
TX packets:0 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:0 (0.0 b) TX bytes:0 (0.0 b)
Base address:0x2540 Memory:fbfc0000-fbfe0000

3- ethtool em1/em2/l0 查看指定网卡状态

\Settings for em1:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supported pause frame use: Symmetric
Supports auto-negotiation: Yes
Advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Speed: 100Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
MDI-X: on (auto)
Supports Wake-on: pumbg
Wake-on: g
Current message level: 0x00000007 (7)
drv probe link
Link detected: yes

4- sar工具，清楚看到网卡带宽是否打满，监控网络流量
sar -n DEV/EDEV/NFS/NFSD/SOCK/ALL
sar -n DEV (统计时间) （统计次数） ：sar -n DEV 1 4（监控网络流量）

sar-n显示网络信息，DEV显示网络接口信息，EDEV显示网络错误的统计数据，NFS统计活动的NFS客户端信息，NFSD统计NFS服务器的信息，SOCK显示套接字信息，ALL显示所有5个开关

关注sar命令使用，统计、监控服务器信息

5-查看服务器网卡相关日志
/var/log/messages里面有没有关于网卡的日志，有没有网卡up/down的记录

tail -n 100 /var/log/messages |grep （em1/em2/up/down/fail）

6- iptraf
实时查看网络流量信息文本界面工具，不自带

centos用yum -y install iptraf安装

7-ifstat

查看实时网络流量

8- iftop 实时查看网卡流量
详细描述：自己博客《ifstat和iftop网络流量实时监控》