Kubuntu 20.04 LTS - 以太网接口在一段时间不活动后停止

问题描述

我在通过 DELL WD15 扩展坞连接到网络的 DELL XPS 13 9360 上使用 Kubuntu 20.04 LTS。几分钟不活动后,以太网接口停止工作,没有任何互联网连接或 LAN 工作。尝试断开连接并重新连接不起作用,因为一旦停止,它就无法获取 DHCP 地址。有时它甚至表现得就像网络电缆断开连接一样。我唯一能做的就是重新启动。我更换了网线 (CAT 5)、RJ45 插头,但没有其他任何效果

这是拓扑:

路由器 -> CAT 5 电缆 -> 交换机 -> CAT 5 电缆 -> RJ45 插头 -> DELL WD 15 扩展坞 -> USB-C -> 计算机。

尝试了以下拓扑:

路由器 -> CAT 5 电缆 -> RJ45 插头 -> DELL WD 15 扩展坞 -> USB-C -> 计算机 不会改变任何东西。

以下是一些信息:

*-network:2
   description: Ethernet interface
   physical id: 4
   bus info: usb@4:1.2
   logical name: enxa44cc8b16f57
   serial: a4:4c:c8:b1:6f:57
   size: 1Gbit/s
   capacity: 1Gbit/s
   capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
   configuration: autonegotiation=on broadcast=yes driver=r8152 driverversion=v1.10.11 duplex=full ip=192.168.1.15 link=yes multicast=yes port=MII speed=1Gbit/s

Settings for enxa44cc8b16f57:
    Supported ports: [ TP MII ]
    Supported link modes:   10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Half 1000baseT/Full 
    Supported pause frame use: No
    Supports auto-negotiation: Yes
    Supported FEC modes: Not reported
    Advertised link modes:  10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Full 
    Advertised pause frame use: Symmetric Receive-only
    Advertised auto-negotiation: Yes
    Advertised FEC modes: Not reported
    Link partner advertised link modes:  10baseT/Half 10baseT/Full 
                                         100baseT/Half 100baseT/Full 
                                         1000baseT/Full 
    Link partner advertised pause frame use: Symmetric
    Link partner advertised auto-negotiation: Yes
    Link partner advertised FEC modes: Not reported
    Speed: 1000Mb/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

更奇怪的是,我还有一个 DELL XPS 15 9570 盒子,在同一网络上运行相同的 Kubuntu 版本(20.04.1 LTS),使用相同的 DELL WD 15 扩展坞,具有完全相同的拓扑结构,不显示问题。

以下是 DELL XPS 15 的相同信息:

*-network:0
   description: Ethernet interface
   physical id: 2
   bus info: usb@4:1.2
   logical name: enxe4b97acb30ee
   serial: e4:b9:7a:cb:30:ee
   size: 100Mbit/s
   capacity: 1Gbit/s
   capabilities: ethernet physical tp mii 10bt 10bt-fd 100bt 100bt-fd 1000bt 1000bt-fd autonegotiation
   configuration: autonegotiation=on broadcast=yes driver=r8152 driverversion=v1.10.11 duplex=full ip=192.168.1.47 link=yes multicast=yes port=MII speed=100Mbit/s

Settings for enxe4b97acb30ee:
    Supported ports: [ TP MII ]
    Supported link modes:   10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
                            1000baseT/Half 1000baseT/Full 
    Supported pause frame use: No
    Supports auto-negotiation: Yes
    Supported FEC modes: Not reported
    Advertised link modes:  10baseT/Half 10baseT/Full 
                            100baseT/Half 100baseT/Full 
    Advertised pause frame use: Symmetric Receive-only
    Advertised auto-negotiation: Yes
    Advertised FEC modes: Not reported
    Link partner advertised link modes:  10baseT/Half 10baseT/Full 
                                         100baseT/Half 100baseT/Full 
                                         1000baseT/Full 
    Link partner advertised pause frame use: Symmetric
    Link partner advertised auto-negotiation: Yes
    Link partner advertised FEC modes: Not reported
    Speed: 100Mb/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

我能看到的唯一区别是我的 DELL XPS 15 连接速度为 100Mbit/s,而 XPS13 连接速度为 1Gbit/s。我不确定这种差异来自哪里,但我已经在 XPS 13 上配置了网络管理器,以便让链接协商“手动”而不是“自动”或“忽略”,并以 100Mbit/s 的速度强制它,但是,除了界面变慢了,没有任何变化,问题仍然存在。

在从 18.04 LTS 迁移到 20.04 LTS 之前,此问题之前并未发生。我认为这是一个 20.04 LTS 问题,但我有两个运行相同版本的机器,只有一个有问题。两个机器运行相同的内核版本,即 Ubuntu 20.04.1 LTS。

有人可以帮我吗?

非常感谢。

亲切的问候,

西摩

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