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24.7 Production Series / IPv6 connectivity from LAN side not working

« on: November 20, 2024, 04:22:28 pm »

Hello people, I am new to OPNsense and I am trying to setup a firewall in my homelab for use on my network and having a hard time getting IPv6 to the Internet working from the LAN side.
The LAN side seems to get IPv6 and routes but packets don't go anywhere after the firewall.

I attached the network layout, the Interfaces Overview, a ping test from the firewall itself  that works as expected.

Attached is also some tests from inside the LAN, where you can see the guest gets IPv6, routes but can ping and a traceroute ends up on the firewall.

When I filter the logs on Firewall, Log Files, Live View for the src IP for a ping test it passes on these default rules:
lan > IPv6 RFC4890 requirements (ICMP)
wan < let out anything from firewall host itself

I am at a loss on what to do, IPv6 connectivity worked before I implemented OPNsense by connecting the router to the physical switch in the topology.

I researched quite a lot but could not get it to work as expected, here is my current configuration:

Interface LAN settings:
Block private networks: unchecked
Block bogon networks: unchecked
MTU: 1472 (same as router says, tried with/without)
IPv4 Configuration Type: Static IPv4
IPv6 Configuration Type: Track Interface
Parent Interface WAN

Interface WAN settings:
Block private networks: unchecked
Block bogon networks: unchecked
IPv4 Configuration Type: DHCP
IPv6 Configuration Type: DHCPv6
MTU: 1472 (same as router says, tried with/without)

DHCPv6 client configuration:
Prefix delegation size: 64
Request prefix only: checked
Send prefix hint: checked