After booting, Unraid will act like a fresh install regarding networking — it will request an IP from your router via DHCP. Check your router’s DHCP lease table for the new IP address. The server name will remain unchanged.
Unraid maps specific MAC addresses to interface names (eth0, eth1, etc.). If your hardware changes, Unraid might see the new card as eth1 but the config file is trying to set an IP on eth0 (which doesn't exist). unraid reset network settings install
You want to reinstall Unraid on your existing USB drive but keep your disk array assignments, shares, and dockers — but you want to . After booting, Unraid will act like a fresh
If DHCP is broken on your router:
Unraid OS stores network configuration in persistent files on the boot USB drive. If misconfigured (e.g., wrong interface, static IP outside subnet, VLAN errors), the web UI may become unreachable. This paper outlines a safe method to without reinstalling the entire OS. Unraid maps specific MAC addresses to interface names