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Reflection is set to "use system default" in the NAT rule, as is the case for the documentation for NAT reflection (I'm following method 1). I've tried enabling reflection and disabling force gateway without any changes to behavior. If you reference the screenshot, it seems that the rdr is applied correctly, but the firewall blocks the traffic redirected to 10.0.1.2.

I've attached the linked image, I just had to downscale it a bit. Block private addresses is already off on WAN, and the WAN address for opnsense is always 192.168.86.2 (dhcp reservation).

Adding that from the same LAN client, I am able to directly use wget/curl to 10.0.1.2:80 without any issue, and there is not generally any other firewall rules blocking LAN -> DMZ connections. Looking at the firewall log, I can see that the same connection (from the POV of the firewall) is blocked when the result of the rdr rule, but passed if it is a direct connection.

Firewall log: https://drive.google.com/file/d/1fHwGOXNZeLku4mB2D3xY2U96TWPebs2T/view?usp=sharing

I'm following the documentation guide on setting up NAT reflection. Like in the guide, I have an nginx server and want to use NAT reflection to allow WAN, LAN, and DMZ clients to use the reverse proxy. The only difference I can tell from the documentation is that my nginx server has multiple interfaces, including one on the LAN.

I have set up the DNAT rule:
Interface - WAN, LAN, DMZ_VLAN
Source - Any:Any
Destination - 192.168.86.2:8080 (the opnsense WAN address, as it is currently behind another NAT)
NAT - 10.0.1.2:80 (the nginx DMZ IP address)

This should already allow LAN and WAN clients to connect to the server. WAN clients are able to connect. However, this is not working for LAN clients, and I can see in the firewall log that the default deny rule is being applied. I enabled the automatic firewall rule generation like in the documentation, which I can see has already created a floating rule that should allow LAN and WAN clients through to the DMZ address.

However, this is not the case, and when I use wget/curl from a LAN client fetching http://192.168.86.2:8080, I can see that the firewall is blocking the traffic using the default deny rule. This is despite the generated rule allowing any source to 10.0.1.2:80 on LAN, WAN, and DMZ interfaces.

Strangely, another port forward to another host on port 22 is working properly from both WAN and LAN clients, although this host does not have multiple interfaces.

Seriously, if you want fine grained control, the firewall rules are where you enforce it. There is no higher level abstraction in OPNsense.

I agree, but surely for a large number of VPN connections reflecting the OpenVPN options to the firewall automatically would be more secure than having a human manually perform this?

I could do this, but I would need to create rules for each OpenVPN interface because each one gets access to a different LAN subnet. I would like to avoid setting up individual rules for each connection because I've already specified which subnets i want to give access in the "local network" setting.

I have several OpenVPN server (legacy) setups with specific attached Local Network options for each one. However, a connected user can still connect to anything on the LAN network because of the "let out anything from firewall host itself" floating rule regardless of the Local Network value. Is there any way I can block this behavior without setting up individual rules for each VPN interface. Also, this behavior only started when I updated to 24.7.

I put the VPN server on its own interface and subnet range and bridged it with the existing VLAN. I also enabled interclient communication. Neither allowed the client to get a gateway

I'm already using VLANs regardless of the OpenVPN setup, it automates routing permissions. My hope is to attach clients to their VLAN directly, avoiding extra manual work in defining rulesets for each client.

I will take a look at your suggestions using a bridge between the OpneVPN interface and VLAN interface.

Another observation, the client has received IP address 10.0.2.6 with a subnet mask of 255.255.255.252.
In the configuration, the client's tunnel network should be 10.0.2.0/24

I'm a little new to vpn setup in general, so apologies if there is something simple I am missing.

I've created a simple setup:
I have a VLAN from 10.0.2.1/24 and vlan tag 11
I created an openvpn server with tunnel network of 10.0.2.0/24
The corresponding openvpn client also has tunnel network of 10.0.2.0/24

When I connect from a windows client, it is able to grab the IP 10.0.2.6, but has no gateway
The client is unable to connect to any other server on its vlan
Running tracert, the connection attempt uses the client's existing gateway instead of the vpn network's gateway

Any ideas on how to fix this issue? I suspect I need to add the vlan tag to the client's interface but I'm unsure of how to do that.