ethtool的基本設置

 

 

　ethtool是設置網卡屬性、IP/TCP相關協議屬性的基本工具，功能仍是很強大的。ubuntu的版本里沒有默認集成，使用apt-get install 安裝之。。。。

 

使用概要：
ethtool ethx       //查詢ethx網口基本設置，其中 x 是對應網卡的編號，如eth0、eth1等等
ethtool –h        //顯示ethtool的命令幫助(help)
ethtool –i ethX    //查詢ethX網口的相關信息 
ethtool –d ethX    //查詢ethX網口註冊性信息
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] [duplex half|full]  [autoneg on|off]        //設置網口速率10/100/1000M、設置網口半/全雙工、設置網口是否自協商

ethtool -k      //查看protocol offload的屬性

ethtool -K|--offload DEVNAME Set protocol offload  // 設置protocol offload的屬性，這個命令很強大，待會再講

[ rx on|off ]
[ tx on|off ]
[ sg on|off ]
[ tso on|off ]
[ ufo on|off ]
[ gso on|off ]
[ gro on|off ]
[ lro on|off ]
[ rxvlan on|off ]
[ txvlan on|off ]
[ ntuple on|off ]
[ rxhash on|off ]

 

使用舉例：

1）[root@linux /]# 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）[root@linux /]# ethtool -i eth1
   driver: e1000
   version: 5.0.43-k1
   firmware-version: N/A
   bus-info: 06:08.1

3）[root@linux /]# 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） 把網卡eth0 速度改成10Mb/s，採用半雙工；

[root@cuc03 beinan]# ethtool -s eth1 speed 10 duplex half
[root@cuc03 beinan]# ethtool eth1
Settings for eth1:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Advertised auto-negotiation: No
        Speed: 10Mb/s 注：速度 10M/s
        Duplex: Half  注：半雙工
        Port: MII
        PHYAD: 32
        Transceiver: internal
        Auto-negotiation: off
        Supports Wake-on: pumbg
        Wake-on: d
        Current message level: 0x00000007 (7)
        Link detected: no 注：eth1沒有激活；

5）把網卡eth0 速度改成100Mb/s，採用全雙工；

[root@cuc03 beinan]# ethtool -s eth1 speed 100 duplex full 
[root@cuc03 beinan]# ethtool eth1
Settings for eth1:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Supports auto-negotiation: Yes
        Advertised link modes:  10baseT/Half 10baseT/Full
                                100baseT/Half 100baseT/Full
        Advertised auto-negotiation: No
        Speed: 100Mb/s  注：速度 100M/s
        Duplex: Full 注：全雙工
        Port: MII
        PHYAD: 32
        Transceiver: internal
        Auto-negotiation: off
        Supports Wake-on: pumbg
        Wake-on: d
        Current message level: 0x00000007 (7)
        Link detected: no 注：eth1網卡沒有激活；

6） 最後關於這個ethtool -k eth0 就特別說明一下，這個是顯示網卡的一些特別的協議開關

root@node4:/home/fbw# ethtool -k eth0
Offload parameters for eth0:
rx-checksumming: on
tx-checksumming: off
scatter-gather: off
tcp-segmentation-offload: off
udp-fragmentation-offload: off
generic-segmentation-offload: off
generic-receive-offload: on
large-receive-offload: off
rx-vlan-offload: on
tx-vlan-offload: on
ntuple-filters: off
receive-hashing: on

   特別注意，加紅的那個參數，以前看到別人遇到這個問題，在部署OpenStack的計算節點的時候，如何將computer部署在臺式機上，ssh鏈接虛擬機就特別卡，鏈接超時將近1多鍾，可是若是將其部署在刀片上就沒有任何問題。因而，後面將問題定位到臺式機的BCM的網卡上，發現只要敲一下 ethtool -K eth0 tx off ，即只要關掉包發送校檢和，就能夠正常ssh鏈接。