About 2 weeks ago I installed an antivirus (ESET nod32) on my Mint 20.1 server. However, after discovering that it is not at all optimized for Linux (blocked basically all my ports + connections and provided no firewall manager), I uninstalled it and my connections began working again. Recently, after toying around with setting up a Squid proxy server, my ethernet connection has stopped working again. Some diagnostics have shown that the server is detecting the connection, my driver is working just fine, and other devices connected to that router are having no issues; so I suspect it's a configuration issue. It's also worth noting that at the moment I am able to get a temporary connection with a USB wifi adapter.
Here's my output of inxi -Fxz:
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
As well as the output for ethtool eno1:
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