From the description and the provided diagram, it looks like the setup involves two separate networks — one through your “Home Router” (with Wi-Fi and Remotes) and another through the “Audio Router/Hub” where the Roon Server and Ropieee endpoints live.
Please note that Roon relies on multicast traffic for discovery (RAAT). Multicast generally does not pass across different subnets/VLANs unless explicitly configured on the router (for example, with IGMP proxying, multicast routing, or mDNS reflector).
Could you please clarify what you mean by “different networks”? Are your Home Router and Audio Router running on the same IP subnet (e.g., 192.168.x.x), or do they each use separate subnets/VLANS?
If they are separate, you will need to enable proper multicast forwarding between them for Roon endpoints to be visible.
Thanks.
Yes, there is two networks, separated by OpenWRT router.
One is 192.168.0.0/24, the other is 192.168.1.0/24.
It was working until yesterday morning. The Ropieee Devices (RP3) on 192.168.0.0/24 could be found by RoonServer on 192.168.1.0/24.
BTW, thanks, let me check my Router again.
I have done both 192.168.0.0/24 as home network and 192.168.1.0/24 as Audio dedicated network not to support IPv6. Then I restarted both home Aterm router and audio OpenWRT router, all were back! I’m happy that Roon Server could detect all Ropieee devices on both home and audio network.
At this point, why Roon Server discovery Ropieee devices as Roon Bridge over the Audio Router. Since Multicast can’t go over the router in general. Why?
Everything works that what I have done before , perhaps in IPv4 base.
Why there is Audio Router (OpenWRT), because I would like to separate Home devices and Digital Audio devices like Roon Server.
Why there is Some endpoint on Home Network, because Roon Everywhere to support i.e. living roon audio which is not just for Roon but also for Airplay , etc. for my family. So multicast of RoonServer have to beyong Audio OpenWRT Router to the Home Network to find RoonBridge devices.
Now it is working on IPv4 base.
Again I would like to challenge it on IPv6 base in near sometime. I’m still learning what and where was changed on 9.1 in Roon World.