linux下如何看网卡是千兆还是百兆的

电玩女神 2022-02-13 09:47 871阅读 0赞

一、命令详解  
ethtool是Linux下用于查询及设置网卡参数的命令。  
ethtool \[options\]  
命令选项：

> ethtool ethX /  
> ethtool –h //显示ethtool的命令帮助(help)  
> ethtool –i ethX //查询ethX网口的相关信息  
> ethtool –d ethX //查询ethX网口注册性信息  
> ethtool –r ethX //重置ethX网口到自适应模式  
> ethtool –S ethX //查询ethX网口收发包统计  
> ethtool –s ethX \[speed 10|100|1000\]\\ //设置网口速率10/100/1000M  
> \[duplex half|full\]\\ //设置网口半/全双工  
> \[autoneg on|off\]\\ //设置网口是否自协商  
> \[port tp|aui|bnc|mii\]\\ //设置网口类型

二、查看过程  
2.1 ifconfig查看网卡信息

[root@master ~]# ifconfig
    ens33: flags=4163<UP,BROADCAST,RUNNING,MULTICAST>  mtu 1500
            inet 192.168.64.129  netmask 255.255.255.0  broadcast 192.168.64.255
            inet6 fe80::b00e:da4d:a946:25c4  prefixlen 64  scopeid 0x20<link>
            ether 00:0c:29:49:83:af  txqueuelen 1000  (Ethernet)
            RX packets 53  bytes 5995 (5.8 KiB)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 58  bytes 8095 (7.9 KiB)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0
    
    lo: flags=73<UP,LOOPBACK,RUNNING>  mtu 65536
            inet 127.0.0.1  netmask 255.0.0.0
            inet6 ::1  prefixlen 128  scopeid 0x10<host>
            loop  txqueuelen 1  (Local Loopback)
            RX packets 0  bytes 0 (0.0 B)
            RX errors 0  dropped 0  overruns 0  frame 0
            TX packets 0  bytes 0 (0.0 B)
            TX errors 0  dropped 0 overruns 0  carrier 0  collisions 0

2.1 ethtool查看网卡带宽

1、[root@master ~]# ethtool ens33
    Settings for ens33:
    	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: 1000Mb/s  ------------------------------------>网卡速度 ，可知现在是千兆网卡
    	Duplex: Full
    	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

三、ethtool其他命令选项

1）[root@linux /]# ethtool -i eth1
       driver: e1000
       version: 5.0.43-k1
       firmware-version: N/A
       bus-info: 06:08.1
    2）[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
    3）[root@linux /]# ethtool -s eth1 autoneg off speed 100 duplex full
    
    
    相关：
    1）[root@linux /]# which ethtool
        /sbin/ethtool
    2）[root@linux /]# rpm -qf /sbin/ethtool
       ethtool-1.6-5
    3）怎样使ethtool设置永久保存在网络设备中？
       解决方法一:
        ethtool设置可通过/etc/sysconfig/network-scripts/ifcfg-ethX文件保存,从而在设备下次启动时激活选项。 
    例如：ethtool -s eth0 speed 100 duplex full autoneg off
    此指令将eth0设备设置为全双工自适应，速度为100Mbs。若要eth0启动时设置这些参数, 修改文件/etc/sysconfig/network-scripts/ifcfg-eth0 ，添加如下一行: 
     ETHTOOL_OPTS="speed 100 duplex full autoneg off"
    解决方法二:
    将ethtool设置写入/etc/rc.d/rc.local之中。

参考：[https://blog.csdn.net/wh8\_2011/article/details/50442296][https_blog.csdn.net_wh8_2011_article_details_50442296]

[https_blog.csdn.net_wh8_2011_article_details_50442296]: https://blog.csdn.net/wh8_2011/article/details/50442296