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    Problems configuring VM builtin firewall with NAT + Port Forwarding + Hairpinning

    I have a server with Proxmox 4.0-57 with the built-in firewall activated for the datacenter. I have a single public IP address (e.g. 1.2.3.4) and my CTs/VMs have IPs in the subnet 10.10.10.0/24 and connected to internet using NAT: ## /etc/network/interfaces iface lo inet loopback auto eth0...

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