Mac OSX High Sierra 10.13.6
MacPro 3.1 / 2x2.8GHz Quad-Core / SSD OS / HDD DATA
Roon 1.6 (build 475) 64bit
Network Details (Including networking gear model/manufacturer and if on WiFi/Ethernet)
AirPort Extreme ‘N’ dual band wireless router
Core connected via ethernet
Most output devices are connected via hardwire (except Apple HomePod)
TP-Link 16 port switch (TL-SG116)
Audio Devices (Specify what device you’re using and its connection type - USB/HDMI/etc.)
Marantz AV7005 - Ethernet
Marantz AV8801 - Ethernet
Marantz AV8802 - Ethernet
Apple HomePod - Wireless
Oppo UPD-203 - Ethernet
Oppo UPD-205 - Ethernet
Apple Airport Express N (x2) - Ethernet
Apple TV 2nd gen (not used w/Roon)
Apple TV 3rd gen (not used w/Roon)
Apple TV 4th Gen HD - Ethernet
Apple TV 5th gen 4k - Ethernet
Description Of Issue
Audio zones come and go, somewhat randomly. Currently, I’m only able to see HomePod as an available source. Sometimes no devices are available. Later today, I will expect other and all devices will appear. I’ve tried re-booting core, router, cable modem, but nothing seems to correct the issue permanently.
Not sure if a setting is incorrect or an update to one of my devices is causing this new issue. Please help debug the root cause.
@Junior77 Sam What are the DNS settings for your router and are all the devices using DHCP or FIXED IP addresses?
If the router is giving out DHCP based DNS settings then this could be the issue.
You should see something like this in you mac’s system prefs under network and advanced DNS tab if using DHCP or non greyed out if you are using FIXED
Ideally you should have your local router (APE) an ISP one and also ideally a public one (Google or CloudFlare) as you see here mine has all 3. If you only have 2 options try your local router and 184.108.40.206 or 220.127.116.11
I wouldn’t focus on the DNS entries in your case here, I suspect this is a multicast issue and multicast traffic is not being properly passed through at one point in the chain.
I should note that we have often seen sub-par performance from Apple Airport routers, as mentioned in our Networking Best Practices. I can’t say for certain if this is the root cause, but it is one of the possible causes of the issues you’re seeing.
Are all of your Ethernet devices connected to this switch? What happens if you connect a few of your Marantz devices to the router instead of the switch, do they show up then? What about if they are connected via WiFi?
Generally we can’t recommend specific models, but we have found that standard consumer-grade routers perform the best (ASUS/TP-Link/Netgear/Mesh Style) and allow multicast to properly pass through. You can check out some Community recommendations in the following thread:
Update: Was still having good results with the switch out of the system.
I then decided to put back my previous (Older) 16port dlink switch. I’ve had no reoccurrence of the issue I was having. Assuming this lasts…the tplink switch failed in less than 2 months. Shame…it seemed to be a robust, compact, metal housing switch. Too bad it couldn’t be a little more reliable. I wonder what the warranty/replacement hustle will be.
Thank-you everyone for your help in troubleshooting. I’ll be sure to follow up if anything changes.