derek

I’m a bit late to the party. I was a network admin in another life and believe I can help out. I’ve skimmed existing conversations but not fully poured over them.

That said: I’d print the routing tables for the switches and firewall and review them. Considering firewall rules is sensible but it seems you’ve already done quite a bit of investigation there. It sounds like there is some vlan configuration missing. Like one of the switches doesn’t have the vlan interface defined or named in its vlan database.

Review the routing tables and confirm who owns each vlan and what those networks are aware of. Also toggle your logging options on so you can review them and test with more info than pass/fail.

It very well may be a OPNsense firewall knowledge thing but I’m not convinced. If you’re still working on this tomorrow I’d be happy to help root-cause the problem and fill in the gaps between RTFM and old YouTube videos. :)

I call bullshit on this “don’t have the time” shtick. If one doesn’t have time to review code prior to hacking on it then they ought to rearrange their priorities.

Offloading this basic and essential responsibility to any tool is an explicit abdication of claims to grievance over the result of such negligence.

So much more so when offloading that responsibility to LLM “agents”. If you find yourself disagreeing with this then you need to educate yourself about those tools.

I recommend this Internet of Bugs video: Don’t Use Any AI Agents or Browsers Until You Watch This www.youtube.com/watch?v=TdHg9ee56Iw

and the deeper dive on their second channel: Technical Breakdown: How AI Agents Ignore 40 Years of Security Progress www.youtube.com/watch?v=_3okhTwa7w4

This isn’t some anti-AI doomer crap. This is understanding computer science and continuing to think critically about its evolution.