igb LAN interface flapping every 30 minutes but WAN on same NIC not flapping

Started by HardTack5, June 30, 2025, 05:11:18 PM

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EDIT: I was running netmap driver for zenarmor in native mode, I switched to emulated and it's been stable over the last few hours since switching. I suspect there is  more to this, because if the native driver was so broken as to flap a link ever 30 minutes I'm sure it would be a  known issue. For now I have a workaround, but this isn't resolved  really.

LAN interface igb0 flaps every 30 minutes, pretty much to the second. The WAN interface on the same NIC does not flap. It flaps in a tight cluster of 3 or 4 flaps, then is fine for 30 minutes. It's been doing this for at least 1 week.

Additional changes in this timeframe were a Zenarmor install. I don't know if it was doing it prior, it could have been. 

Given the frequency, this doesn't look to be physical, switch port sees no errors of any kind (apart from logging the flaps).

I keep coming across an EEE energy saving feature that may be a cause, but doesn't seem clear (if possible) to disable on 25.x ?

Anything else I can do to troubleshoot this please?
   
igb driver. Dell K9CR1 INTEL I350T4 Quad Port
OPNsense 25.1.9