I am trying to figure this out, maybe someone can help me.
I have Volumio on a Rasp-Pi with a wired connection to my LAN off of my central router. My network has two wireless access points. WAP#1 = the main router, WAP#2 = secondary wireless router connected as a switch (no WAN connection.)
I am using an airplay app on my Android tablet. I can see Volumio as an airplay device when connected wirelessly to WAP#2, but not when connected to WAP#1. As far as I can tell, the settings are the same on both access points (which are different brands). The odd thing is that it is the access point on the central router where I cannot see the device. Also, while connected to WAP#1, I can see my other devices, it is only Volumio that is missing.
Any ideas on what may cause this? I played with UPNP settings as well and ALG settings, with no change in behavior.