MinimServer slow to detect

[dsb17]

I have done some investigating with Wireshark that confirm your diagnosis. I will describe my findings as reference for others who might run into similar problems. My configuration:

control point (PC) -- (wired) --> Asus router -- (wireless) --> Asus Media Bridge --(wired) --> MinimServer (QNAP) & Renderer (Oppo).

As a test, I also connected the QNAP with a wired connection to the Asus router, but that is an impractical long term configuration.

I have done packet capture by triggering M-SEARCH from my control point. Wireshark captured from the following network interfaces:
- control point
- Asus Router
- Asus Media Bridge

I can detect the M-SEARCH packet on the Router, and MinimServer (when using the wired connection to the router) responds within 3 seconds.

I cannot detect the M-SEARCH packet on the Media Bridge. MinimServer (with wireless connection) and the Oppo renderer don't respond.

This seems to isolate the problem to multicast forwarding on the bridge between the wired and wireless interfaces on the Router. It is interesting that the control point PC is able to receive M-SEARCH packets coming from the Oppo renderer (in the backward direction through the wireless connection). This suggests that there are setting that enable proper multicast forwarding on the Asus hardware; unfortunately most setting are hidden on the media bridge, so that I cannot see what they are.

I have enabled multicast forwarding on the router. I also enabled and disabled IGMP snooping on all wireless bands, with the same outcome.

I realize this is not a MinimServer issue. I will try ask for help on the Small Net Builders forum, but if you have any suggestions on how to proceed from here, I would greatly appreciate them. This is the bottom of my networking knowledge.