Can't use Internet in VMs because Proxmox assigns his very own IP to them??

Hello,

I just installed Proxmox and was eager to run my first VM. For testing purposes I grab the latest ArchLinux ISO and try to spin up the VM. I left every setting under "Network" as-is, with vmbr0 etc.

Now, when I boot the VM, as soon as the TTY shows up, I lose my connection to the Proxmox WebUI.
I didn't enable the option to boot VMs upon startup so I just pressed the power button to send the ACPi signal and shutdown. After starting the server again, the WebUI worked again, after...

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