查看Linux下网卡连接/工作状态（up还是down)?

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#up #linux #工作 #basic #网络 #服务器

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本文介绍了几种在Linux系统中检查网卡是否连接并处于UP状态的方法，包括使用mii-tool、networkstatus命令和服务命令，以及ifconfig命令。这些方法可以帮助远程判断服务器网卡的工作状态。

第1种方法

    [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

[root@localhost /root]# ifconfig
eth0      Link encap:Ethernet HWaddr 00:19:DB:41:08:1B
          inet addr:211.100.10.235 Bcast:211.100.10.235 Mask:255.255.255.255
          UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
          RX packets:178812 errors:0 dropped:0 overruns:0 frame:0
          TX packets:153415 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:100
          RX bytes:33094019 (31.5 MiB) TX bytes:71911163 (68.5 MiB)
          Base address:0x8f00 Memory:fd6e0000-fd700000

eth1      Link encap:Ethernet HWaddr 00:19:DB:41:08:1C
          inet addr:192.168.1.115 Bcast:192.168.1.255 Mask:255.255.255.0
          UP BROADCAST MULTICAST MTU:1500 Metric:1
          RX packets:13805 errors:0 dropped:0 overruns:0 frame:0
          TX packets:11356 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:1520439 (1.4 MiB) TX bytes:5406527 (5.1 MiB)
          Base address:0x7f00 Memory:fd2e0000-fd300000

eth2      Link encap:Ethernet HWaddr 00:19:DB:41:08:1D
          inet addr:202.194.99.62 Bcast:202.194.99.62 Mask:255.255.255.255
          UP BROADCAST RUNNING PROMISC MULTICAST MTU:1500 Metric:1
          RX packets:158024 errors:0 dropped:0 overruns:0 frame:0
          TX packets:182280 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:1000
          RX bytes:74748049 (71.2 MiB) TX bytes:33535454 (31.9 MiB)
          Base address:0xdf00 Memory:fdee0000-fdf00000

lo        Link encap:Local Loopback
          inet addr:127.0.0.1 Mask:255.0.0.0
          UP LOOPBACK RUNNING MTU:16436 Metric:1
          RX packets:99 errors:0 dropped:0 overruns:0 frame:0
          TX packets:99 errors:0 dropped:0 overruns:0 carrier:0
          collisions:0 txqueuelen:0
          RX bytes:12978 (12.6 kiB) TX bytes:12978 (12.6 kiB)

第二种方法，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

第三种方法

ethtool eth0

Settings for eth0:
Link detected: yes

http://hi.baidu.com/nan5715077/blog/item/4bd02f071b5f01ca7a8947cd.html

FAQ：如何查看Linux下网卡是否连接(UP)？

来自：杨志刚博客 ( http://yangzhigang.cublog.cn)

//如何不到服务器端，通过指令判断Linux的网卡是否已经连接到网络并为UP状态。有的人用ifconfig -a 查网卡已经配置的正确的IP地址，可是就是ping不能网络，到机房一看网线没接，^@^! 网络不通会有好多原因，但最先查的就是网卡的网络是还已连接并UP。就像办公室的MM喊着说上不了网

，结果“本地连接”都是“X”的一样的情况。

本FAQ将帮助您如何不到服务器端，通过指令判断Linux的网卡是否已经连接到网络并为UP状态！

ASK：

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！

     [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

http://blog.chinaunix.net/u2/71257/showart_973425.html