Re: [Hampshire] IGMP protocol with BT home hubs

2016-03-07 Thread Joseph Bennie 
BT routers only support igmp v2 if you enable it ... its typically disabled by 
default. (finding it in the advanced settings may take some digging.. look for 
multicast / multicast routing. )

Its more likely however the Pc is acting as the controller and has a firewall, 
and the firewall is either filtering the igmp packets (check in and out rules)  
 or has stealth mode (or equivalent ) enabled.


https://en.wikipedia.org/wiki/Internet_Group_Management_Protocol

On 7 Mar 2016, at 04:37, James Courtier-Dutton 
mailto:james.dut...@gmail.com>> wrote:


Hi,

IGMP is part of the multicast protocol. Generally, it tends to be filtered, so 
will not work across the internet. My guess is that the home hub does not 
support it, but a normal switch should support it. If it is a smart switch, you 
might need to go into the config and spacifically enable multicast.

Kind regards

James

On 6 Mar 2016 18:42, "Roger Munford" 
mailto:rogermunf...@parussoftware.co.uk>> 
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.

The German manufacturers insist there is nothing wrong but do not have any 
ideas. It is likely that there is a handful of similar setups working in the UK 
but not this one.

The system consists of 3 solar inverters and a controller that is connected 
with a switch which is also connected to the local network and ultimately the 
internet. The inverters and the controller connect to the company server and 
upload data. There is a local configuration programme which runs on a PC and 
connects to each of the inverters. Everything works as expected network wise.

The system has a "heartbeat" so that each inverter gets a message every second 
to continue. If the message does not arrive the inverter automatically shuts 
down and this is this function that is not working.

Buried in the documentation I found the following:   "For the correct function 
. all network devices used must support the IGMP protocol, minimum
required version 2. (IGMP V2)"

I had to look up IGMP having not come across it before. I originally thought 
that the heartbeat signal comes from the controller and so only the switch 
should be required to support IGMP. I couldn't find any reference in the switch 
documentation but assumed that a brand new switch would support it. I tried two 
other switches that were to hand and had the same results.

My latest thought is that the heartbeat may actually come over the internet 
from the company server. That would mean that the network router would have to 
support the IGMP protocol. The network router is an oldish BT home hub. This 
thought has just occurred and I cannot get at it to look because it is some 
miles away.

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?

Thanks for your patience, I hope the above was relatively clear.

Roger


--
Please post to: 
Hampshire@mailman.lug.org.uk
Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire
LUG URL: http://www.hantslug.org.uk
--
--
Please post to: 
Hampshire@mailman.lug.org.uk
Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire
LUG URL: http://www.hantslug.org.uk
--

-- 
Please post to: Hampshire@mailman.lug.org.uk
Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire
LUG URL: http://www.hantslug.org.uk
--

Re: [Hampshire] IGMP protocol with BT home hubs

2016-03-07 Thread Roger Munford 
Thanks Simon and James. Could I say with a good degree of certainty that 
new switches from D-Link and TPLink would support it. I cannot find any 
to say if they would or wouldn't.


The "blurb" about this system says that commonly used ethernet network 
components can be used. However I am at a standoff with the support 
engineer who is adamant that there is a network problem and therefore 
cannot support this new piece of kit that has only just reached the UK. 
I somehow have to convince him that it should be referred to the 
developers. If it is not still underdevelopment why did the website 
suddenly duplicate itself in Spanish? last week.


Thanks again for your help.

Roger

On 07/03/2016 09:34, Simon Reap wrote:

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




--
Please post to: Hampshire@mailman.lug.org.uk
Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire
LUG URL: http://www.hantslug.org.uk
--

Re: [Hampshire] IGMP protocol with BT home hubs

2016-03-07 Thread Simon Reap 

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

--
Please post to: Hampshire@mailman.lug.org.uk
Web Interface: https://mailman.lug.org.uk/mailman/listinfo/hampshire
LUG URL: http://www.hantslug.org.uk
--