Dieser Bereich kann Inhalte enthalten, die nicht für alle Nutzer geeignet sind. Dazu können unter anderem Texte, Medien oder Diskussionen gehören, die als beleidigend, extremistisch, gewaltbezogen oder anderweitig belastend empfunden werden. Wenn du solche Inhalte nicht sehen möchtest, nutze bitte die jeweiligen Filter- und Meldeoptionen der Plattform oder meide entsprechende Threads/Communities.
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. :)