大约两周前，我在我的 Mint 20.1 服务器上安装了防病毒软件 (ESET nod32)。然而，在发现它根本没有针对 Linux 进行优化（基本上阻止了我所有的端口 + 连接并且没有提供防火墙管理器）后，我卸载了它，我的连接又开始工作了。最近，在尝试设置 Squid 代理服务器后，我的以太网连接再次停止工作。一些诊断显示服务器正在检测连接，我的驱动程序工作正常，并且连接到该路由器的其他设备没有问题；所以我怀疑这是一个配置问题。还值得注意的是，目前我可以通过 USB wifi 适配器获得临时连接。
这是我的 inxi -Fxz 的输出：
System:
Kernel: 5.4.0-66-generic x86_64 bits: 64 compiler: gcc v: 9.3.0
Desktop: Cinnamon 4.8.6 Distro: Linux Mint 20.1 Ulyssa
base: Ubuntu 20.04 focal
Machine:
Type: Server System: Dell product: PowerEdge T320 v: N/A serial: <filter>
Mobo: Dell model: 0W7H8C v: A03 serial: <filter> BIOS: Dell v: 1.5.1
date: 03/08/2013
Battery:
Device-1: hidpp_battery_1 model: Logitech Wireless Mouse Dell WM514
charge: 55% (should be ignored) status: Discharging
CPU:
Topology: Quad Core model: Intel Xeon E5-2407 0 bits: 64 type: MCP
arch: Sandy Bridge rev: 7 L2 cache: 10.0 MiB
flags: avx lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx bogomips: 17600
Speed: 1200 MHz min/max: 1200/2200 MHz Core speeds (MHz): 1: 1200 2: 1200
3: 1200 4: 1200
Graphics:
Device-1: Matrox Systems G200eR2 vendor: Dell driver: mgag200 v: kernel
bus ID: 06:00.0
Display: x11 server: X.Org 1.20.9 driver: modesetting unloaded: fbdev,vesa
resolution: 1600x900~60Hz
OpenGL: renderer: llvmpipe (LLVM 11.0.0 256 bits) v: 4.5 Mesa 20.2.6
direct render: Yes
Audio:
Message: No Device data found.
Network:
Device-1: Broadcom and subsidiaries NetXtreme BCM5720 2-port Gigabit
Ethernet PCIe
vendor: Dell driver: tg3 v: 3.137 port: ecc0 bus ID: 01:00.0
IF: eno1 state: up speed: 100 Mbps duplex: full mac: <filter>
Device-2: Broadcom and subsidiaries NetXtreme BCM5720 2-port Gigabit
Ethernet PCIe
vendor: Dell driver: tg3 v: 3.137 port: ecc0 bus ID: 01:00.1
IF: eno2 state: down mac: <filter>
Device-3: NetGear type: USB driver: mt76x2u bus ID: 1-1.2:6
IF: wlx3894edc5d6e1 state: up mac: <filter>
Drives:
Local Storage: total: 1.46 TiB used: 12.68 GiB (0.9%)
ID-1: /dev/sda vendor: Dell PowerEdge RAID Card model: PERC H710
size: 278.88 GiB
ID-2: /dev/sdb vendor: Dell PowerEdge RAID Card model: PERC H710
size: 278.88 GiB
ID-3: /dev/sdc vendor: Dell PowerEdge RAID Card model: PERC H710
size: 931.00 GiB
ID-4: /dev/sdd type: USB vendor: Dell model: Internal Dual SD
size: 1.90 GiB
RAID:
Hardware-1: Broadcom / LSI MegaRAID SAS 2208 [Thunderbolt]
driver: megaraid_sas v: 07.713.01.00-rc1 bus ID: 08:00.0
Partition:
ID-1: / size: 273.00 GiB used: 12.68 GiB (4.6%) fs: ext4 dev: /dev/sda5
Sensors:
System Temperatures: cpu: 31.0 C mobo: N/A
Fan Speeds (RPM): N/A
Info:
Processes: 229 Uptime: 1h 24m Memory: 15.59 GiB used: 1.46 GiB (9.4%)
Init: systemd runlevel: 5 Compilers: gcc: 9.3.0 Shell: bash v: 5.0.17
inxi: 3.0.38
以及 ethtool eno1 的输出：
Settings for eno1:
Supported ports: [ TP ]
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/Half 1000baseT/Full
Advertised pause frame use: Symmetric
Advertised auto-negotiation: Yes
Advertised FEC modes: Not reported
Link partner advertised link modes: 10baseT/Half 10baseT/Full
100baseT/Half 100baseT/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: Twisted Pair
PHYAD: 1
Transceiver: internal
Auto-negotiation: on
MDI-X: on
Supports Wake-on: g
Wake-on: d
Current message level: 0x000000ff (255)
drv probe link timer ifdown ifup rx_err tx_err
Link detected: yes
有任何想法吗？
答案1
按照@waltinator的建议检查 的输出后sudo journalctl -b 0 -u NetworkManager，结果是：
<info> [...] device (eno1): carrier: link connected
<warn> [...] dhcp4 (eno1): request timed out
我终于意识到，检查我的服务器通过以太网连接的 WiFi 扩展器可能会有所帮助（我知道，这很糟糕，但它适用于我的计算机的布局）。快速 WPS 重置后，一切又恢复正常工作状态。