Weird bug or broken config with ubuntu lxc

[Padi100]

Hello everybody,

I hope this is the right place to post this weird issue I have with LXC container.

If I create an LXC with Debian 11 / 12 the DNS configuration from the DHCP Server is used. But with Ubuntu 22.04 / 23.04 / 23.10 the resolv.conf is always overwritten by the dns settings of the proxmox host. Is this normal behaviour for Ubuntu LXC?

Ubuntu LXC with wrong DNS setting but the correct IP:


Debian LXC with correct DNS settings:

 

[dietmar]

You can configure the DNS settings for the Container using the GUI.

 

[Padi100]

Yes, I know. That's my problem. I don't understand why the ubuntu-lxc uses the settings from the host and on debian not. The ubuntu container doesn't get the DNS-Settings and I want to know if this is intended or not. Because for me it doesn't make sense that two different linux OS handle the DNS settings received from the DHCP server differently.