OpnSense hangs LAN after restart- No access in LAN for devices

[Pipe]

This Post is a copy of my post in Portuguese. Reason: No answers there. So now I'm looking for help here. Here is the link to the original post:https://forum.opnsense.org/index.php?topic=45964.0

Trouble:

Let's say a bizarre problem... I'll try not to go into too much detail.

Last night, out of the blue, my FIre Stick stopped, Messages on WPP weren't going out... I saw that I couldn't access the Opnsense web GUI. I restarted my Switch and it came back (which I didn't agree with). This morning I went back to it.
I lost full access to my Appliance with OpnSense installed. After restarting, even with a network cable directly to the switch, it could not be accessed. So I restarted switch and it came back again. Not satisfied, I plugged the UTP cable directly into the FW's LAN port. To my surprise, it didn't access, I restarted, it accessed..

I replaced the Firewall with a desktop that I have left here. I uploaded the Backup, adjusted the ETH's, everything was fine and working beautifully.

In the afternoon, after completing the download of the latest update (25.1), as I was still on 24.7.xx. After that, FW rebooted as expected. Guess what?? I could no longer access it. I went down to the garage and turned on the monitor and there it was, on the Pormpt Login screen, that is, normal!
What I did then:
1. I restarted SW, it worked.
2. I changed the SW (for the third time), same symptom, when I rebooted the FW, LAN access only came back after restarting the SW.
3. I changed the ETH LAN (Realtek) to the WAN (Intel PRO), in the OpnSense web interface, to see if it was something with the ETH Realtek (even though I had already installed the os-realtek driver), same symptom.
3. I connected a UTP cable from my notebook to the OpnSense LAN directly. I rebooted, and to my (not so expected surprise, as it was not possible for me to have 3 defective Switches), after uploading OpnSense, again without LAN access.

Summary Symptoms:
Every time OpnSense is restarted, LAN access is lost. Access only resumes after restarting Switch. If connected with a cable directly between the notebook and LAN, same behavior.
Symptom on client devices: No network identified.

I would appreciate it if someone could give me some light.

Thanks


==============================================================

Dear,

Updating my tests.

I installed another Firewall (Hardware) with another OS. The brand here is irrelevant.

I left the same LAN/WAN settings, identical.

I put it as FW on my network, restarted it several times and the result: It worked normally.

I confess that I am very worried. Even because, I have a project with a remote client that I have already left 2 Firewalls ready with OpnSense.

[pfry]

I'd start with ARP: Check ARP caches on all machines ("arp -a" or "Interfaces: Diagnostics: ARP Table" on OPNsense) and forwarding database on the switch, and logs on firewall (for ARP movement - unlikely in this case). Not just presence, but correct MAC to IP mappings. A bit of a long shot, but a start.

[R41d3n.Vx]

Hi all,

I'm experiencing a very similar issue but I couldn't find any issue.
Does anyone have an update on this issue?

Thanks

[cookiemonster]

this isn't an known issue. Either configuration problem, hardware problem or both.
You won't have answers without expressing your setup, hardware, etc. All you would expect anyone bringing to you to diagnose a problem with something you are familiar with.