Linux bridge not working - no internet access for VMs

[Stanko]

Hello,
I have installed Proxmox on Debian 11 following this tutorial.
https://pve.proxmox.com/wiki/Install_Proxmox_VE_on_Debian_11_Bullseye

Everything works fine except my VMs don’t have internet access.

I have created Linux Bridge, which you can see on a screenshot. You can also see a screenshot of /etc/network/interfaces

When I created Linux Bridge only thing that changed is the internet connection on my Debian host which became less stable.

I hope someone can tell me how do I get Internet access on my virtual machines.

 

[Moayad]

Can you ping the VMs from your host or vice versa?

did you see the /etc/resolv.conf inside the VM? please also post the config of the VM qm config <VMID>

 

[Stanko]

I have an Ubuntu VM installed and when I start it I get "NetworkManager. service fails to start"
I was able to configure IP address through GUI and ping successfully Debain host but I couldn't ping the gateway. Also from host PC I can ping VM.
You can see the screenshot of /etc./resolv. conf, IP address conf. and qm conf of Ubuntu VM.

 

[Moayad]

Could you ping google for example or 8.8.8.8 from the VM?