Unable to resolve anything (DNS not working)

[Brokeda]

Hello everyone,

I have a single Proxmox host that is running in Hetzner bare metal servers for about 7 months. Recently, I tried to download some ISOs from the Proxmox host using wget and I discovered that the host wasn't resolving domains at all. Also, nslookup and dig gives me errors:

nslookup not found:
root@mglab ~ # nslookup google.com
-bash: nslookup: command not found

dig not found message:
root@mglab ~ # dig google.com
-bash: dig: command not found

Host command is working, but the dns resolution doesn't work (it just remain stuck and it goes in timeout):
root@mglab ~ # host google.com
;; connection timed out; no servers could be reached

This is my /etc/resolv.conf

root@mglab ~ # cat /etc/resolv.conf
search mglab
nameserver 213.133.98.98
nameserver 213.133.99.99
nameserver 213.133.100.100
### Hetzner Online GmbH installimage
# nameserver config

DNS servers are reachable and working. Also, the strange thing is that, inside my VMs and containers, I can successfully resolve domains: so the UDP traffic towards port 53 isn't blocked by some datacenter firewall.
Also, if I resolve manually some domains and I put them in /etc/hosts, I can successfully reach servers and download ISOs via wget.

Can you help me in order to troubleshoot this issue? Please feel free to ask other configurations!
Thanks in advance!

 

[wolfgang]

Hi,

The firewall for VM is different from the host firewall.
I would check you host firewall setting.

Also, nslookup and dig gives me errors:

This is not an error.
The tools are not installed.