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[simoncn]

Thanks for trying this. I haven't been able to find a way to change the IGMP snooping setting on a BT HomeHub 5.

Are you able to connect your Mac to the router using an Ethernet cable? If this works as expected, it confirms that it is an issue with the router.

If this fixes the problem, you could try completely disabling the 5 GHz wireless band on your router and using the 2.4 GHz band instead. The HomeHub is known to have problems with multicast messaging on the 5 Ghz band. This is mentioned on the Troubleshooting page that I linked in my earlier post.

The 2.4 GHz band is slower, so using this might cause other problems with throughput. If so, your only other solution is to use a different router and configure the HomeHub as a "pure modem" (connected to the new router) to access your broadband connection.