I've had an issue with my router and had to replace it. Unfortunately, now my Synology NAS does not appear in the device list of the router or using Synology Assistant.

The server is connected using an Ethernet cable, so I would assume the reconnection would be automatic.

I have tried restarting the server, but it did not reconnect on successful boot.

I know it's still alive because I can hear the disks working on something, so the system is up.

Is there another way to restore connectivity?

Sounds like I may be able to connect the device to my desktop using an Ethernet cable, but to what end?