Block DHCP to and from the Proxmox host, but allow DHCP between VMs/LXCs

I try to replace my routers DHCP Server with the ISC Kea Server in a LXC. As I'm new to this, I want to try it on a few client LXCs first. For this I want to block all DHCP requests that would go to the router and all DHCP requests that could reach the new DHCP Server from the outside of the Proxmox host.

I tried to block all traffic in/out port 67/68 in the firewall of the Datacenter and the Proxmox host but my test LXC always gets an IP from my router. I've read that others have...

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