If I understand your post correctly, then
* pinging the DNS server from the host works
* DNS resolution on the host works
* DNS resolution in the container does NOT work
* but pinging the DNS server from the container works (?)
Can you "manually" resolve domain names e.g. using dig -t A...
Maybe I can approach the problem from a different angle: Is my setup very uncommon? Anything that you wouldn't expect, or that you would've done differently?
This is not only a problem for services connecting back to "themselves" via their external address, but also for the monitoring VM (using...
I have a dedicated server with 1 public IPv4 running Proxmox VE, set up using the Masquerading technique described in the documentation (https://pve.proxmox.com/wiki/Network_Configuration#_masquerading_nat_with_tt_span_class_monospaced_iptables_span_tt) with port forwarding. All guests have...