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无法连接到以太网。ethtool 报告未知速度和未知双工

tag-icon • tag-icon networking network-manager ethernet dhcp
无法连接到以太网。ethtool 报告未知速度和未知双工

我正在尝试通过以太网接收互联网连接。我的桌面运行的是 Ubuntu 16.04。

网络管理器小程序报告已连接到enp0s31f6，但我的计算机尚未收到 DHCP 地址。

dhclient输出似乎表明没有DHCPOFFER从服务器接收到任何请求（DHCPDISCOVER发送了更多请求但输出没有变化）：

~$ sudo dhclient -v enp0s31f6
Internet Systems Consortium DHCP Client 4.3.3
Copyright 2004-2015 Internet Systems Consortium.
All rights reserved.
For info, please visit https://www.isc.org/software/dhcp/

Listening on LPF/enp0s31f6/0c:9d:92:bd:9b:57
Sending on   LPF/enp0s31f6/0c:9d:92:bd:9b:57
Sending on   Socket/fallback
DHCPDISCOVER on enp0s31f6 to 255.255.255.255 port 67 interval 3 (xid=0xfff5a066)
DHCPDISCOVER on enp0s31f6 to 255.255.255.255 port 67 interval 8 (xid=0xfff5a066)
DHCPDISCOVER on enp0s31f6 to 255.255.255.255 port 67 interval 13 (xid=0xfff5a066)
DHCPDISCOVER on enp0s31f6 to 255.255.255.255 port 67 interval 13 (xid=0xfff5a066)

ethtool报告以下信息。和Unknown!属性的值似乎可疑。当这些值未知时，我是否能够连接？如果不能，我该如何解决这个未知值问题？SpeedDuplex

~$ sudo ethtool enp0s31f6
Settings for enp0s31f6:
    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: Unknown!
    Duplex: Unknown! (255)
    Port: Twisted Pair
    PHYAD: 2
    Transceiver: internal
    Auto-negotiation: on
    MDI-X: Unknown (auto)
    Supports Wake-on: pumbg
    Wake-on: g
    Current message level: 0x00000007 (7)
                   drv probe link
    Link detected: no

我尝试手动设置它们的值，但无济于事：

~$ sudo ethtool -s enp0s31f6 speed 1000 duplex full
~$ sudo ethtool enp0s31f6
Settings for enp0s31f6:
    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:  1000baseT/Full 
    Advertised pause frame use: No
    Advertised auto-negotiation: Yes
    Speed: Unknown!
    Duplex: Unknown! (255)
    Port: Twisted Pair
    PHYAD: 2
    Transceiver: internal
    Auto-negotiation: on
    MDI-X: Unknown (auto)
    Supports Wake-on: pumbg
    Wake-on: g
    Current message level: 0x00000007 (7)
                   drv probe link
    Link detected: no

以下是从中过滤的一些片段dmesg，如果它们相关的话：

~$ dmesg | grep enp
[    1.719930] e1000e 0000:00:1f.6 enp0s31f6: renamed from eth0
[    7.980215] IPv6: ADDRCONF(NETDEV_UP): enp0s31f6: link is not ready
[    8.221865] IPv6: ADDRCONF(NETDEV_UP): enp0s31f6: link is not ready
[  314.654059] IPv6: ADDRCONF(NETDEV_UP): enp0s31f6: link is not ready


~$ dmesg | grep e1000e
[    1.339047] e1000e: Intel(R) PRO/1000 Network Driver - 3.2.6-k
[    1.339047] e1000e: Copyright(c) 1999 - 2015 Intel Corporation.
[    1.406037] e1000e 0000:00:1f.6: Interrupt Throttling Rate (ints/sec) set to dynamic conservative mode
[    1.651130] e1000e 0000:00:1f.6 0000:00:1f.6 (uninitialized): registered PHC clock
[    1.719235] e1000e 0000:00:1f.6 eth0: (PCI Express:2.5GT/s:Width x1) 0c:9d:92:bd:9b:57
[    1.719236] e1000e 0000:00:1f.6 eth0: Intel(R) PRO/1000 Network Connection
[    1.719304] e1000e 0000:00:1f.6 eth0: MAC: 12, PHY: 12, PBA No: FFFFFF-0FF
[    1.719930] e1000e 0000:00:1f.6 enp0s31f6: renamed from eth0

Ubuntu 网络管理器 GUI 报告“有线”连接已“连接”，但没有分配地址。

到目前为止，我在调试过程中已多次重新启动机器，但问题仍未得到解决。

附加信息：

~$ ip link show
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN mode DEFAULT group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
2: enp0s31f6: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast state DOWN mode DEFAULT group default qlen 1000
    link/ether 0c:9d:92:bd:9b:57 brd ff:ff:ff:ff:ff:ff
3: wlxe091f519b0f3: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc mq state DOWN mode DORMANT group default qlen 1000
    link/ether e0:91:f5:19:b0:f3 brd ff:ff:ff:ff:ff:ff

~$ ip route 
default via ABC.DEF.176.1 dev wlxe091f519b0f3  proto static  metric 600 
default dev enp0s31f6  scope link  metric 1002 linkdown 
ABC.DEF.176.0/20 dev wlxe091f519b0f3  proto kernel  scope link  src ABC.DEF.188.112  metric 600 
HIJ.KLM.0.0/16 dev enp0s31f6  proto kernel  scope link  src HIJ.KLM.9.24 linkdown

[上面有些 IP 号码被字母掩盖]

一个可能有趣的信息来自：

journalctl /usr/sbin/NetworkManager：

<info>  [1564430899.7494] device (enp0s31f6): state change: unmanaged -> unavailable (reason 'managed') [10 20 2]
Jul 29 16:08:19 computer NetworkManager[947]: nm_device_get_device_type: assertion 'NM_IS_DEVICE (self)' failed

答案1

输出结果ip link show如下：

enp0s31f6: <NO-CARRIER

和dmesg表演

enp0s31f6: link is not ready

都表明物理连接存在问题。

一些可能的原因：

  • 插头没有正确卡入到位
  • 电缆有缺陷
  • 交换机端口已停用或有缺陷

答案2

即使电缆插入正确（用另一台设备检查）并获取信息，我也无法连接到互联网。原因是速度和双面打印没有设置，我需要使用ethtool将速度设置为 100 Mb/s 并将双工设置为全双工：

sudo ethtool -s <adapter_name> speed 100 duplex full

<adapter_name>使用命令时显示的适配器名称在哪里ip a。

同样的问题也出现在另一个操作系统（Windows 11）上，原因也是相同的——我需要在网络设置中设置速度和双工。

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