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Message 1 of 4

Hybrid Connect, network switch, separate DHCP server

FIRSTLY I AM NOT A BT ENGINEER, BUT I have spent a lot of time today experimenting to how the Hybrid Setup works in Fail over.

I have a bespoke setup... VERY bespoke. Network ports all around the house, plugged into a network switch. A Separate DHCP server, hub obviously has this feature disabled. So collectively the Hub is only responsible as a gateway to the internet, not DNS and not DHCP. I then added on the Hybrid connect.

I recently had an outage and the Hybrid connect failed to... well, fail over. In fact as part of this it took out all connectivity on my network.  The hub didn't even respond to pings over Wi-Fi despite being connected and networked ports were all down too. Unfortunately the kit is so new that no-one at BT was able to advise on what the correct configuration should be when NOT USING THE BT HUB AS A DHCP SERVER. Should I plug the device into the switch or the hub, how does it actually fail over? does it reroute traffic to the Hybrid device or does it swap IPs. If you have a bespoke or business setup similar to mine you'll be asking the same questions because this will largely determine your network topology/configuration and setup

Anyway, I determined the issue was the hub and BT are sending a new one. However the current one is mostly functional and barring another weird behaviour from it it's up until the new one arrives.

I figured time to research and try to find out the correct configuration. The good news is that after trying several configurations I know both the configuration and what happens when something bad happens. The bad news is that if your HUB blows you're basically up a creek without a paddle.

First the configuration. I have the Hub as above, but I have the Hybrid Connect hooked into it by Cat6 cable. This gives the best rate of transmission at the full network capability (in my case 1gb network speeds)  You can disconnect the device from the cable seems but this limited the connection to Wi-Fi speeds (much slower) and are affected by all the usual Wi-Fi related issues such as device contention and ethernet taking priority.

Next I decided to try a DR Event (Disaster Recovery) and turned off the fibre modem. This is to simulate the dropped or broken fibre connection into the home.

It took a good few minutes for the Hybrid to realise what had happened before it kicked in. From the Hub control panel you can see it's status, monitoring after it realised the connection was down it took less than a minute for it to connect to 4G. At this point it became clear it had the same IP as before on the network and the Hub had agreed to failover again on the same IP. This confirmed several things.

1. when the connection drops it seems the Hybrid is polling to see if it has connection before letting the hub know to fail over to it. If it was the hub controlling this then it would have spotted it sooner and started the Hybrid connection up.

2. The Hub redirects it's traffic to the Hybrid device. Effectively uses it as the modem and, IMPORTANTLY, this device just therefore has to be easily communicable from the Hub.

3.When the connection is back up the whole thing happens again in reverse.

Several points of note here.

1. The hybrid could be connected by switch, but doesn't need to be. Anyone who's had the issues I've seen due to multiple devices connected to the hub and others connected to a switch also connected to hub may find they can't always talk to each other. This is negated if you ONLY have the hybrid and the switch plugged into the Hub.

2. The Hybrid is slower but providing it's got at least two of the three bars showing Blue, you should be fine. 

3. If your Hub blows, there's no way for the Hybrid to take over, it's not swapping IPS with the Hub and if it's blown then the Hybrid isn't being connected to as a replacement for the Hub. So beware. This is still a risk.

4. from 3. The hybrid will take over when there is loss of service or loss of the modem connected to the hub, it works in tandem with the hub.

I hope this helps some other people with their Hybrid Device setup in a Hybrid network environment. Hopefully in time BT's engineers will be shown how this thing works at a lower level than just 'turn it off and on again, is it plugged into the back'? I should stress this isn't a dig at BT, the kit really is impressive, but BT really should explain to their 3rd line support engineers, how this kit works.


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Message 2 of 4

Re: Hybrid Connect, network switch, separate DHCP server

before anyone points out 4G isn't 1Gigabit network speed. Yes, but my network access to the device is so the cap expectation here is that in DR mode you'll be capped at 4G speeds for internet access.

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Message 3 of 4

Re: Hybrid Connect, network switch, separate DHCP server

I realise this is an old topic, but am interested in your set-up if it's still the same, as I've just ordered Halo3+ with the hybrid connect.

Is your service FTTC or FTTP and what device do you connect as the modem (if FTTC) or to the ONT (if FTTP). 

I understand that the hybrid connect only works with the SH2, but not sure from your post where that sits in relation to your other equipment, particularly the network switch you use.


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Message 4 of 4

Re: Hybrid Connect, network switch, separate DHCP server

FTTP, standard modem and bt router setup.

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