It might also be worth asking Roon support about this. [ETA: I see you posted on the Roon forum as well - hopefully Roon support may chime in.]
Could this be something to do with multicast support on the Draytek? It probably has options to control IGMP proxy and/or IGMP snooping, both of which are mentioned in Roon's Networking Best Practices document.
Could this be something to do with multicast support on the Draytek? It probably has options to control IGMP proxy and/or IGMP snooping, both of which are mentioned in Roon's Networking Best Practices document.
Roon (Mac Mini), Wilson Benesch Full Circle, Expert 1000 Pro CI, Kaiser Chiara
Warwickshire, UK