今天重新认识了Linux 网卡配置

            
                  
                  
                  
root@x4100-9098/etc/ssh#mii-tool eth3
eth3: negotiated 100baseTx-HD, link ok


root@x4100-9098/etc/ssh#ethtool eth3
Settings for eth3:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Half
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: Unknown (auto)
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: no
        
        
我想问的问题是eth3接网线了吗？


找了个linux大牛，看了下，就说了一句:  you need modify the NIC as onboot=yes






证明：
Link detected: no >>>>>  1)可能是没接好网线
                         2)没设置onboot=yes.
                         
     要使用网卡，最好设置onboot=yes,  没设置    onboot=NO 的还有一个后果是，无论如何插拔这个nic, /var/log/meassages里面都不会有任何提示。
                    
                         


当设置好       onboot=yes 后，并重起这个NIC, 正常显示的结果是：


 root@x4100-9098~#ethtool eth3
Settings for eth3:
        Supported ports: [ TP ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
                                1000baseT/Full 
        Advertised pause frame use: No
        Advertised auto-negotiation: Yes
        Speed: 100Mb/s
        Duplex: Half
        Port: Twisted Pair
        PHYAD: 0
        Transceiver: internal
        Auto-negotiation: on
        MDI-X: off (auto)
        Supports Wake-on: d
        Wake-on: d
        Current message level: 0x00000007 (7)
                               drv probe link
        Link detected: yes
  
   root@x4100-9098~#mii-tool
No interface specified
usage: mii-tool [-VvRrwl] [-A media,... | -F media] ...
       -V, --version               display version information
       -v, --verbose               more verbose output
       -R, --reset                 reset MII to poweron state
       -r, --restart               restart autonegotiation
       -w, --watch                 monitor for link status changes
       -l, --log                   with -w, write events to syslog
       -A, --advertise=media,...   advertise only specified media
       -F, --force=media           force specified media technology
media: 100baseT4, 100baseTx-FD, 100baseTx-HD, 10baseT-FD, 10baseT-HD,
       (to advertise both HD and FD) 100baseTx, 10baseT
root@x4100-9098~#
root@x4100-9098~#mii-tool eth3
eth3: negotiated 100baseTx-HD, link ok
root@x4100-9098~#mii-tool eth2
eth2: no link
root@x4100-9098~#mii-tool eth1
eth1: negotiated 100baseTx-HD, link ok
root@x4100-9098~#mii-tool eth0
eth0: negotiated 100baseTx-FD flow-control, link ok




重点：
 1) mii-tool和 ethtool 工具
 2) 如何看状态         
  
  相关资料：      
  http://waibaohuo.blog.163.com/blog/static/129005368201041863046769/
  http://blog.itpub.net/27042095/viewspace-732946/
  http://blog.chinaunix.net/uid-24830931-id-3345567.html