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