我最近买了一个 USB 以太网适配器，因为我的笔记本电脑没有以太网端口。笔记本电脑检测到适配器，驱动程序已安装，但未检测到以太网电缆。该电缆在其他笔记本电脑上工作正常。结果 ethtool enx00e001103008显示：
Settings for enx00e001103008:
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: Half
Port: MII
PHYAD: 0
Transceiver: internal
Auto-negotiation: off
Current message level: 0x00000007 (7)
drv probe link
Link detected: no
检测到的链接始终显示“否”。
的输出为lshw -c network
：
*-network:0
description: Ethernet interface
physical id: 2
logical name: enx00e001103008
serial: 00:e0:01:10:30:08
size: 100Mbit/s
capacity: 100Mbit/s
capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd autonegotiation
configuration: autonegotiation=off broadcast=yes driver=dm9601 driverversion=22-Aug-2005 duplex=half firmware=Davicom DM96xx USB 10/100 Ether link=no multicast=yes port=MII speed=100Mbit/s
更新：我使用了该命令cd /var/log ; tail -f dmesg $(find . -name \*log)
，没有任何警告或错误。使用后，ifconfig -a我得到了以下输出：
anbox0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.250.1 netmask 255.255.255.0 broadcast 0.0.0.0
inet6 fe80::b880:48ff:fe81:ab8e prefixlen 64 scopeid 0x20<link>
ether ba:80:48:81:ab:8e txqueuelen 1000 (Ethernet)
RX packets 0 bytes 0 (0.0 B)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 496 bytes 47816 (47.8 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
enx00e001103008: flags=4099<UP,BROADCAST,MULTICAST> mtu 1500
ether 00:e0:01:10:30:08 txqueuelen 1000 (Ethernet)
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
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 1000 (Local Loopback)
RX packets 2505 bytes 179890 (179.8 KB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 2505 bytes 179890 (179.8 KB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0
wlan0: flags=4163<UP,BROADCAST,RUNNING,MULTICAST> mtu 1500
inet 192.168.54.62 netmask 255.255.254.0 broadcast 192.168.55.255
inet6 fe80::bb7b:44f4:84f1:5d11 prefixlen 64 scopeid 0x20<link>
ether 90:cd:b6:00:4b:23 txqueuelen 1000 (Ethernet)
RX packets 7323 bytes 5071950 (5.0 MB)
RX errors 0 dropped 0 overruns 0 frame 0
TX packets 8581 bytes 1294698 (1.2 MB)
TX errors 0 dropped 0 overruns 0 carrier 0 collisions 0