On 06/03/2016 18:41, Roger Munford wrote:
> I have a problem with a new, complex system for managing ethernet 
> connected solar inverters and the problem may well be down to missing 
> multicasts from a BT home hub.
>
> For anybody that has followed what I have been trying to describe, do 
> BT Home hubs support IGMP? is there something in the configuration 
> that enables/disables it and is there a test that I can do to verify it?
>
The BT Home Hubs 3, 4  and 5 definitely support IGMP - BT Youview 
requires it.
When the old BT freeview service stopped and I was "upgraded" to 
YouView, I had to get a Home Hub 4 installed to replace my solid 
reliable Netgear DG384 which didn't support IGMP (as far as I could 
tell).  My old Homehub 1 (once I'd retrieved it from its hiding place in 
the loft) didn't work either.
There's a fairly old list of routers which support IGMP (and hence BT 
YouView) at 
https://community.bt.com/t5/YouView-Boxes/Known-Routers-to-Work-with-Multicast-IGMP/td-p/994338
Simon
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