@David-TP -- After bashing my head against the wall, I finally remembered that the Synology was firewalled to specific internal sub-nets as it was internet facing at one time. It came to light when I...

@David-TP - I had one last thought: I had docker running with Portainer with a MAC Vlan. I thought maybe Deco objected (even though I can't imagine why). I have since shut down Portainer to remove...

@David-TP -- Thanks for the reply. :) The current setup is just for debugging purposes. While the Deco does offer DHCP to the NAS, no communication between the devices has worked regardless of...

@Alexandre. No issues with address reservation. DHCP works fine. The Synology remains inaccessible with either static or dynamic IP

Hello -- Network topology was: ONT -> Untangle (DHCP) -> 4-port Linksys Switch --> Deco Main Unit (1 of 3) in Access Point Mode Switch -> Synology DSM-918 (hardwire) Everything worked great. Network...