Long story short, I built a new server using parts from two old Unraid servers. This particular one has a new case, USB drive from Server 1, HDDs from Server 1, and MoBo/CPU from Server 2. Put everything together and it started up fine, but seems unable to access the internet (I'm unable to access the appfeed and Plex wont start due to an internet error). I remember having similar issues with this Motherboard earlier so I'm attempting to match the same network settings that I used for that machine, but whenever I enter my changes and hit apply, it just reverts back to prior settings. Also of note, the MAC address field is blank.

Diagnostics attached

tower-diagnostics-20261002-1604.zip

The problem is that both onboard NICs on this board report the same MAC address. You can see it in the syslog: the Intel I225-V and the Intel I219-V show an identical MAC when they're detected. Unraid names its network interfaces by MAC address, so both NICs try to take the same name. One of them fails to rename (rename_eth121 ... File exists) and there's no eth0 at all. The Network Settings page applies to eth0, so Apply does nothing and the page goes back to the old values. That's also why the MAC address field is blank. This probably explains the network trouble you had with this board before too.

To fix it:

1. In the BIOS, disable the onboard NIC you don't use. Your cable is in the 2.5G Intel I225-V port, so disable the 1G Intel I219-V.

2. Shut down, put the flash drive in another computer, and delete (or rename) these two files: config/network-rules.cfg and config/network.cfg.

3. Boot again. Unraid will create new network settings with one NIC as eth0, using DHCP. Check your router for the IP it gets, or look at the local console.

4. Then set your static IP, gateway, and DNS under Settings > Network Settings, and check that they save. For DNS, use your router or a public DNS server. Don't use a DNS server that ran on one of the old servers.

If you need both onboard ports, the duplicate MAC has to be fixed on the board itself. A BIOS update might do it (you're on P1.40), or ask ASRock. Unraid can't reliably manage two NICs that share one MAC.

If you still have no internet after this, please post new diagnostics.