![]() ![]() But if it doesn't ever see a client ask for a given multicast stream, the AP won't send it to wireless. If the AP sees a client subscribe to a stream via the IGMP protocol, the AP will start forwarding that stream to wireless. ![]() To help do that, some APs do "IGMP Snooping" which lets them see when a client tries to subscribe to, say, a multicast video stream. Since multicasts are a pain on wireless networks, you want to keep any unneeded multicasts off of the wireless. So if it's your AP's bridging code that's broken, this will hopefully get around it.īroken IGMP Snooping. Relaying packets between wireless clients is often done in the Wi-Fi radio chipset itself (or its driver), without going through the AP's host OS's bridging code. If your BT Hub 3 is a simultaneous dual-band AP, make sure to have your laptop join in the same band (2.4 vs. Some APs don't do a great job of bridging from LAN to WLAN, or from 2.4GHz WLAN to 5GHz WLAN, etc. Disable that.īroken bridging between interfaces on the AP. ![]() Some APs have a feature that tries to keep wireless devices from being able to talk to each other directly. "Wireless client isolation", or "AP isolation", like your Chromecast app suggested. For now, just temporarily while troubleshooting, disable all wireless security on your network, to eliminate this possibility. Multicasts have to be encrypted with a different key, and sometimes with a completely different cipher (encryption algorithm) depending on how you have WPA2 or WPA set. Group cipher and group key problems with WPA2 and WPA. So make sure it's in B/G/N mode, and set the multicast rate down to 1Mbps if it'll let you. None that if you have, say, a 2.4GHz B/G/N AP, but you have it in N-only mode, you probably can't set the multicast rate as low as it can go unless you re-enable the B/G rates. For the sake of troubleshooting this, if you can set it, please set it as low as you can. Some Wi-Fi APs (Access Points "wireless router" in layman's terms) let you set the multicast rate (sometimes on an "advanced wireless options" screen). Here are some of the top ways it can go wrong, with suggestions for how to test or fix each: Chromecasts are apparently discovered by the DIAL protocol, which builds on UPnP, which often does discovery by sending out UDP multicasts with HTTP-like syntax inside.ĭoing multicast on Wi-Fi networks is tricky, and vendors get it wrong all the time. ![]()
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