Since upgrading to 26.1.11_5 (I don't think this behavior occurred with 26.1.11/26.1.11_3) my Realtek RTL8125 port was exhibiting an odd behavior.
My management LAN disappeared in the early hours of Friday. From another LAN I could see the firewall, but nothing else on the management network. In the Kea logs re0 was reported as not running and so was not servicing DHCP renewals.
Quote2026-07-04T00:04:55
Warning kea-dhcp4 WARN [kea-dhcp4.dhcpsrv.0x4fe545a5c008] DHCPSRV_OPEN_SOCKET_FAIL failed to open socket: the interface re0 is not running
Initially rebooted and the management LAN was running again.
The management LAN went down again around 18:00. This time I disabled/enabled the interface.
Just before midnight and the management LAN went down again. This time I've moved it to another device [Intel I226-V].
Now into Saturday morning and the management LAN has disappeared again. So it looks less likely to be a NIC issue. I think the DHCP renewal process is failing as a consequence of whatever the trigger is for this behavior.
I could do with some pointers on where to look to get useful debugging information, and for completeness the only other activity on this firewall was on Thursday night I did the Outbound to SNAT migration.
Thanks