http://blog.chinaunix.net/uid-23381466-id-58878.html

Ethtool是用於查詢及設定網絡卡引數的命令。
概要：
ethtool ethX    //查詢ethX網口基本設定
ethtool –h        //顯示ethtool的命令幫助(help)
ethtool –i ethX //查詢ethX網口的相關資訊
ethtool –d ethX //查詢ethX網口註冊性資訊
ethtool –r ethX //重置ethX網口到自適應模式
ethtool –S ethX //查詢ethX網口收發包統計
ethtool –s ethX [speed 10|100|1000]\       //設定網口速率10/100/1000M
[duplex half|full]\           //設定網口半/全雙工
[autoneg on|off]\          //設定網口是否自協商
[port tp|aui|bnc|mii]\       //設定網口型別
[phyad N]\             
[xcvr internal|exteral]\
[wol p|u|m|b|a|g|s|d...]\
[sopass xx:yy:zz:aa:bb:cc]\
[msglvl N]
舉例：
1）[

[email protected] /]# ethtool eth1
Settings for eth1:
Supported ports: [ TP ]
Supported link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Supports auto-negotiation: Yes
Advertised link modes:   10baseT/Half 10baseT/Full
100baseT/Half 100baseT/Full
1000baseT/Full
Advertised auto-negotiation: Yes
Speed: 1000Mb/s
Duplex: Full
Port: Twisted Pair
PHYAD: 0
Transceiver: internal
Auto-negotiation: on
Supports Wake-on: umbg
Wake-on: d
Link detected: yes
2）[

[email protected] /]# ethtool -i eth1
driver: e1000
version: 5.0.43-k1
firmware-version: N/A
bus-info: 06:08.1
3）[[email protected] /]# ethtool -S eth1
NIC statistics:
rx_packets: 58068300
tx_packets: 87124083
rx_bytes: 1589713008
tx_bytes: 2165825901
rx_errors: 0
tx_errors: 0
rx_dropped: 0
tx_dropped: 0
multicast: 0
collisions: 0
rx_length_errors: 0
rx_over_errors: 0
rx_crc_errors: 0
rx_frame_errors: 0
rx_fifo_errors: 0
rx_missed_errors: 0
tx_aborted_errors: 0
tx_carrier_errors: 0
tx_fifo_errors: 0
tx_heartbeat_errors: 0
tx_window_errors: 0
4）[

[email protected] /]# ethtool -s eth1 autoneg off speed 100 duplex full
相關：
1）[[email protected] /]# which ethtool
/sbin/ethtool
2）[[email protected] /]# rpm -qf /sbin/ethtool
ethtool-1.6-5
3）怎樣使ethtool設定永久儲存在網路裝置中？
解決方法一:
ethtool設定可通過/etc/sysconfig/network-scripts/ifcfg-ethX檔案儲存,從而在裝置下次啟動時啟用選項。
例如：ethtool -s eth0 speed 100 duplex full autoneg off
此指令將eth0裝置設定為全雙工自適應，速度為100Mbs。若要eth0啟動時設定這些引數, 修改檔案/etc/sysconfig/network-scripts/ifcfg-eth0 ，新增如下一行:
ETHTOOL_OPTS="speed 100 duplex full autoneg off"
解決方法二:
將ethtool設定寫入/etc/rc.d/rc.local之中。

ethtool eth0 可查是否支援1000M