ubuntu18 usb網卡網速隻有10M解決方法

手上有個win10平闆,經折騰,刷成了ubuntu18,但自帶的wifi經千辛萬苦驅動起來後,内網ping值高達200+,遂購買usb網卡一張,ping值降到2以内,可以接受,但是網速隻有10m,無法接受

一.修改網卡參數

1.1 查詢網卡名

ip addr或ifconfig均可

xue@xue-EZpad6:~$ ip addr
2: enx00e04c3603d8: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:e0:4c:36:03:d8 brd ff:ff:ff:ff:ff:ff
    inet 10.0.0.110/24 brd 10.0.0.255 scope global dynamic noprefixroute enx00e04c3603d8
       valid_lft 73698sec preferred_lft 73698sec
    inet6 fe80::75f7:f5c3:e075:ade6/64 scope link noprefixroute 
       valid_lft forever preferred_lft forever      

1.2 安裝ethtool工具

sudo apt install ethtool

xue@xue-EZpad6:~$ ethtool enx00e04c3603d8
Settings for enx00e04c3603d8:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  Not reported
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 10Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 32
        Transceiver: internal
        Auto-negotiation: on
Cannot get wake-on-lan settings: Operation not permitted
        Current message level: 0x00007fff (32767)
                               drv probe link timer ifdown ifup rx_err tx_err tx_queued intr tx_done rx_status pktdata hw wol
        Link detected: yes      

問題就在這裡,Speed: 10Mb/s

1.3 通過測試,指令如下

sudo ethtool -s enx00e04c3603d8 speed 100 duplex full autoneg off      

speed 100 設定速度(我的網卡最大隻支援100Mb/s),duplex full 設定全雙工模式,  autoneg off 關閉自動協商

注:最重要的是第三個參數,開啟了自動協商,設定速度是無效的,因為網卡和路由器協商的結果就是10Mb/s,隻有關閉了協商,才能讓網卡強制運作100Mb/s模式.

二.設定開機啟動

經過ethtool設定後,隻是目前有效,重新開機裝置後即失效,故需把指令添加到開機啟動中,讓他自動生效

2.1 編輯/lib/systemd/system/rc.local.service,設定啟動參數,添加如下代碼

sudo vim /lib/systemd/system/rc.local.service 

[Install]
WantedBy=multi-user.target
Alias=rc-local.service      

2.2設定軟連接配接，開機啟動回去/etc/……這個目錄下去找檔案

ln -s /lib/systemd/system/rc.local.service /etc/systemd/system/rc.local.service

2.3建立/etc/rc.local,寫入需要開啟啟動的指令

sudo vim /etc/rc.local

#!/bin/bash
ethtool -s enx00e04c3603d8 speed 100 duplex full autoneg off
exit 0      

:x儲存退出

2.4 為/etc/rc.local附加執行權限

sudo chmod +x /etc/rc.local

2.5 重新開機裝置

2.6 用ethtool檢查結果

xue@xue-EZpad6:~$ ethtool enx00e04c3603d8
Settings for enx00e04c3603d8:
        Supported ports: [ TP MII ]
        Supported link modes:   10baseT/Half 10baseT/Full 
                                100baseT/Half 100baseT/Full 
        Supported pause frame use: No
        Supports auto-negotiation: Yes
        Supported FEC modes: Not reported
        Advertised link modes:  Not reported
        Advertised pause frame use: No
        Advertised auto-negotiation: No
        Advertised FEC modes: Not reported
        Speed: 100Mb/s
        Duplex: Full
        Port: MII
        PHYAD: 32
        Transceiver: internal
        Auto-negotiation: off
Cannot get wake-on-lan settings: Operation not permitted
        Current message level: 0x00007fff (32767)
                               drv probe link timer ifdown ifup rx_err tx_err tx_queued intr tx_done rx_status pktdata hw wol
        Link detected: yes