查看Linux下网卡状态或 是否连接

1) 通过mii-tool指令

[root@localhost root]# mii-tool

eth0: negotiated 100baseTx-FD, link ok

eth1: no link

或

[root@localhost root]# mii-tool -v

eth0: negotiated 100baseTx-FD, link ok

product info: vendor 00:50:43, model 2 rev 3

basic mode: autonegotiation enabled

basic status: autonegotiation complete, link ok

capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control

link partner: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

eth1: no link

product info: vendor 00:50:43, model 2 rev 3

basic mode: autonegotiation enabled

basic status: no link

capabilities: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD

advertising: 100baseTx-FD 100baseTx-HD 10baseT-FD 10baseT-HD flow-control

或

[root@localhost root]# mii-tool -w

21:20:33 eth0: negotiated 100baseTx-FD, link ok

21:20:33 eth1: no link

//mii-tool主要是用于配置网卡工作模式的指令，同时也可以进行查询、监控等工作！

2)

[root@localhost /]# /etc/init.d/network status

Configured devices:

lo eth0 eth1

Currently active devices:

lo eth0

等同于

[root@localhost root]# service --status-all

............

............

Configured devices:

lo eth0 eth1

Currently active devices:

lo eth0

............

............

3)ifconfig -a

[root@localhost /]# 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

4)ethtool

ethtool eth0

Settings for eth0:

Supported ports: [ MII ]

Supported link modes: 10baseT/Half 10baseT/Full

100baseT/Half 100baseT/Full

1000baseT/Half 1000baseT/Full

Supports auto-negotiation: Yes

Advertised link modes: 10baseT/Half 10baseT/Full

100baseT/Half 100baseT/Full

1000baseT/Half 1000baseT/Full

Advertised auto-negotiation: Yes

Speed: 100Mb/s

Duplex: Full

Port: Twisted Pair

PHYAD: 1

Transceiver: internal

Auto-negotiation: on

Supports Wake-on: g

Wake-on: d

Current message level: 0x000000ff (255)

Link detected: yes

ethtool eth1

Settings for eth1:

Supported ports: [ MII ]

Supported link modes: 10baseT/Half 10baseT/Full

100baseT/Half 100baseT/Full

1000baseT/Half 1000baseT/Full

Supports auto-negotiation: Yes

Advertised link modes: 10baseT/Half 10baseT/Full

100baseT/Half 100baseT/Full

1000baseT/Half 1000baseT/Full

Advertised auto-negotiation: Yes

Speed: Unknown! (0)

Duplex: Half

Port: Twisted Pair

PHYAD: 1

Transceiver: internal

Auto-negotiation: on

Supports Wake-on: g

Wake-on: d

Current message level: 0x000000ff (255)

Link detected: no

从上面可以看出eth0 处于连接状态，eth1没有连接