I had the same problem, only when I had everything hardwired to a cheap switch it worked.

I could not get it through one of my Cisco 2960 switches. Last resort could be to connect it all directly to the router.

I had to look for an old laptop, these modern things have no ethernet port anymore. Good luck. It is worth it, my network performance of the 218 has improved. Less drops and smoother recognition on the network without rebooting.

Main: DSP8000SE< 218 < Farad Super3 TMCB < PS Audio P10. Room correction: Focus Fidelity.
Second: Fostex Fe206NV2 < Audio innovations 500 valve amp < Wiim Pro +
Study: DSP33 < Reviver < MS200
Server: ROCK + Tidal on NUC, fiber on 2x cisco 2960, HD-Plex LPS.
Gone: DSP7200SEu, DSW, DSP5500mkI & DSP5000mkI, 508.20, 210