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Hello, thanks for the quick reply.

I also believe that the issue might stem from the network hardware provided by my ISP. To clarify, I live in a rental apartment in Sweden, and like most rentals, the network is provided through a box with several outputs. Unfortunately, I can't find any model number or hardware information to specify the type of equipment it is, nor can I interact with the network box through any interface to understand how the ports are set up. Upon closer inspection, I see that all ports are labeled as LAN ports, which seems contradictory because when I connect my router or Proxmox server, I receive valid WAN IPs (not RFC1918 addresses).

I am currently not at home to try your suggested modifications but will do so as soon as I get back. Additionally, the WAN IPv4 on OPNsense is not an RFC1918 address, which, as I understand, indicates that the ISP is indeed providing a WAN IP, not a LAN IP as you mentioned. Wouldn't this suggest that the ISP is delivering a proper WAN connection?

Thanks again for your assistance!

Hello everyone,

First of all, I want to mention that I am relatively new to OPNsense and wouldn't consider myself an expert in networking. With that said, I've been trying to set up OPNsense on my homelab running Proxmox. In my homelab, I have two NICs: one is used as the WAN port (directly connected to the hardware provided by my ISP, although I'm not sure of the exact type), and the other is used as my LAN interface. I've installed a VM running OPNsense and connected the NICs with the corresponding virtual bridges.

The setup of OPNsense was quite straightforward. The only modification I made was changing the LAN IPv4 to a static one to prevent IP conflicts with my local computer. For the WAN, I used DHCP for both the IPv6 and IPv4 addresses. When I check the interfaces, I can confirm that the WAN has received valid addresses. Additionally, the WAN gateway address appears to be correct, as my home network router also shows the same WAN gateway.

However, it seems like I do not have internet access as I cannot ping outside the network. Interestingly, I noticed that I am able to ping the gateway using the IPv6 address but not the IPv4 address. Here are the troubleshooting steps I've taken so far:

Reset the ARP tables, as I have reinstalled OPNsense several times.
Verified that the WAN IP of the VM is not the same as the WAN IP for my router.
Temporarily accepted all traffic in and out from the WAN interface.
Checked the routing tables and validated that the correct gateways were specified.
The fundamental issue is that I can't connect to the internet, and my hypothesis is that I can't reach the gateway. If anyone has any suggestions or can guide me toward a solution, it would be greatly appreciated.

Has anyone encountered a similar issue or have any ideas on what might be causing this?

Thank you!