由于ifconfig命令沒法看到網卡的一些狀態， 以下有5種方法查看網卡狀態，是否連通網線

How to check physical Network Link Status on Linux (RHEL/Centos)

原文：

There are several ways to check Link status on RHEL,

As far i used to check by 5- ways. Refer Below

1)

# dmesg | grep eth

.....

e1000: eth0 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None

e1000: eth1 NIC Link is Up 1000 Mbps Full Duplex, Flow Control: None

2)

# mii-tool

eth0: negotiated 100baseTx-FD, link ok

eth1: negotiated 100baseTx-FD, link ok

3)

# ethtool eth0 | grep Link

Link detected: yes

4)

# cat /sys/class/net/eth0/operstate

up

5)

# ip link show

2: eth0: mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:0c:29:b0:ef:e4 brd ff:ff:ff:ff:ff:ff

3: eth1: mtu 1500 qdisc pfifo_fast qlen 1000 link/ether 00:0c:29:b0:ef:ee brd ff:ff:ff:ff:ff:ff

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