Thank you so much for sticking with me on this!
The VM can ping the host, and it can interact with the other VMs, but the telnet command you provided fails.
Forgive me, I know that 'ARP' is a thing, but I don't know how to perform one.
I also uninstalled and reinstalled the client; that didn't seem to work.
Also, I can SSH in from the router, but not the NAS, all of which is on the same LAN...I don't know if that helps.
Thanks,
Joey