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I just spent an hour making Chromecast work, now it's stable. See the attached Google Doc for steps you need to take.
https://docs.google.com/document/d/1t-kVAySE6t_vgP5Lbb796J8-HiPZfIT99ydphDKFYh0/edit?usp=sharing
Can you explain the working principal behind this setting? It does not make sense to me. I believe Chromecast uses some sort of IGMP multicast, which should be only handled by a layer 3 managed switch.
No idea but it worked and still works for me. Disabling broadcast on 2.4 GHz does however render SimpliSafe cameras useless.