DNS connectivity problem, Mint 21

[Parm6]

Mint 21 was working fine until today when I can ping 8.8.8.8 ethernet/wireless but not google.com. I also can't update the system as apt can't find the repo. It is definitely a Mint issue because another distro on the same machine works fine.

I'm guessing the problem is with the DNS server settings. How do I change them?

Thanks

[karlchen]

Mint 23 was working fine until today

I seriously doubt so.
Reason: The most recent Linux Mint version is 21.

Please, provide your Linux Mint System Information as has been explained step by step in this post: viewtopic.php?f=90&t=318644

[Parm6]

Dang. Getting mixed up with something else. Corrected.

[karlchen]

Hello, Parm6.

It would be still much appreciated, if you provided your System Information for your Mint 21 system.

Also, please, share with us what the following 2 terminal commands will display:

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nslookup 8.8.8.8

nslookup dns.google.com

Regards,
Karl

[Parm6]

Thank you Karl

I've fixed it now, temporarily at least, by changing the nameserver in /etc/resolv.conf to 8.8.8.8

[Parm6]

Code: Select all

System:
  Kernel: 5.15.0-46-generic x86_64 bits: 64 compiler: gcc v: 11.2.0 Desktop: Xfce 4.16.0
    tk: Gtk 3.24.23 wm: xfwm dm: LightDM Distro: Linux Mint 21 Vanessa base: Ubuntu 22.04 jammy
Machine:
  Type: Desktop System: Hewlett-Packard product: HP EliteDesk 800 G1 SFF v: N/A
    serial: <superuser required> Chassis: type: 4 serial: <superuser required>
  Mobo: Hewlett-Packard model: 1998 serial: <superuser required> BIOS: Hewlett-Packard
    v: L01 v02.68 date: 03/31/2016
CPU:
  Info: quad core model: Intel Core i7-4770 bits: 64 type: MT MCP arch: Haswell rev: 3 cache:
    L1: 256 KiB L2: 1024 KiB L3: 8 MiB
  Speed (MHz): avg: 3791 high: 3826 min/max: 800/3900 cores: 1: 3810 2: 3782 3: 3804 4: 3774
    5: 3803 6: 3761 7: 3770 8: 3826 bogomips: 54272
  Flags: avx avx2 ht lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
Graphics:
  Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics
    vendor: Hewlett-Packard EliteDesk 800 G1 driver: i915 v: kernel ports: active: VGA-1
    empty: DP-1, DP-2, HDMI-A-1, HDMI-A-2 bus-ID: 00:02.0 chip-ID: 8086:0412
  Display: x11 server: X.Org v: 1.21.1.3 compositor: xfwm v: 4.16.1 driver: X:
    loaded: modesetting unloaded: fbdev,vesa gpu: i915 display-ID: :0.0 screens: 1
  Screen-1: 0 s-res: 1600x900 s-dpi: 96
  Monitor-1: VGA-1 model: Fujitsu Siemens L20T-2 LED res: 1600x900 dpi: 92 diag: 507mm (20")
  OpenGL: renderer: Mesa Intel HD Graphics 4600 (HSW GT2) v: 4.6 Mesa 22.0.5 compat-v: 3.1
    direct render: Yes
Audio:
  Device-1: Intel Xeon E3-1200 v3/4th Gen Core Processor HD Audio
    vendor: Hewlett-Packard EliteDesk 800 G1 driver: snd_hda_intel v: kernel bus-ID: 00:03.0
    chip-ID: 8086:0c0c
  Device-2: Intel 8 Series/C220 Series High Definition Audio
    vendor: Hewlett-Packard EliteDesk 800 G1 driver: snd_hda_intel v: kernel bus-ID: 00:1b.0
    chip-ID: 8086:8c20
  Sound Server-1: ALSA v: k5.15.0-46-generic running: yes
  Sound Server-2: PulseAudio v: 15.99.1 running: yes
  Sound Server-3: PipeWire v: 0.3.48 running: yes
Network:
  Device-1: Intel Ethernet I217-LM vendor: Hewlett-Packard EliteDesk 800 G1 driver: e1000e
    v: kernel port: f080 bus-ID: 00:19.0 chip-ID: 8086:153a
  IF: eno1 state: down mac: <filter>
  Device-2: Qualcomm Atheros AR9287 Wireless Network Adapter driver: ath9k v: kernel pcie:
    speed: 2.5 GT/s lanes: 1 bus-ID: 02:00.0 chip-ID: 168c:002e
  IF: wlp2s0 state: up mac: <filter>

[karlchen]

Hi, Parm6.

You have implemented a workaround by using dns.google.com ( 8.8.8.8 ) as your DNS server.
It might have been helpful to share the output of nslookup 8.8.8.8 and nslookup dns.google.com, while the DNS resolution problem still occurred, and only afterwards implement the workaround.
Without the requested output, now we can only guess what may have been the root cause of your DNS problem.

Regards,
Karl

[Parm6]

I fixed it before seeing the request. If it happens again I'll do that.

[Parm6]

It happened again. /etc/resolv.conf was overwritten as:

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# Generated by Eddie v2.21.8 - https://eddie.website - 13 August 2022 13:29:18 UTC

nameserver 10.7.214.1

Eddie is my VPN (AirVPN).

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nslookup dns.google.com

and

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nslookup 8.8.8.8

gave no output.

Changed the nameserver to 8.8.8.8 and it's all working again.

[karlchen]

Hello, Parm6.

This is the first time that you mention that you connect to the internet through a VPN.

It happened again. /etc/resolv.conf was overwritten as:

Code: Select all

# Generated by Eddie v2.21.8 - https://eddie.website - 13 August 2022 13:29:18 UTC
nameserver 10.7.214.1

Eddie is my VPN (AirVPN).

Code: Select all

nslookup dns.google.com

and

Code: Select all

nslookup 8.8.8.8

gave no output.
Changed the nameserver to 8.8.8.8 and it's all working again.

As I do not know "Eddie", I cannot give any advice, how to check "Eddie's" configuration. Sorry.
But it may be advisible to check the "Eddie" manual pages and/or consult their support team.

Regards,
Karl