I was feeling quite irritated until I came across this community chat .... ok, I'm still irritated but a bit more hopeful now that I know that others are in a similar situation.
How does your system work? The VPN switch plugs into the SH3 and the Netgear switch plugs into the VPN ? Where does the virgin cable go? How do you link in the SH2? Forgive me, I'm new to all of this, so I'm trying to picture the network diagram in my mind!
The netgear VPN switch has to be configured to be a DHCP server address range typically starting at 192.168.1.1 - the VPN switch would typically come with a set of ports for connecting you LAN cables into like any normal switch you could also connect your normal netgear switch into one of these ports.
You will also get a WAN port or ports depending on model. You would connect from the WAN port to your SH3.0 which the VPN switch will see as a default gateway. The SH3.0 range would be starting at 192.168.0.1 - you don't need to change any settings on it this way you can still access the wifi via the SH3.0. If you don't need the wifi then you can change the SH3.0 to work as a modem mode. (You don't need to this if you are happy to access wifi via the SH3.0).
Fairly straight forward to do - shame that Virgin can't fix the SH3.0.
I really appreciate your help in this. I've just upgraded by installing ubiquiti wifi access points in the house. I have a teenage son, uni student son and wife who have discovered that they can't live life without the internet .... they blame me, and I'm definitely not flavour of the month!
Netgear switch not available until August, so I bought the TP Link (which other people, having the same problem with SH3, have done on Amazon)... having trouble configuring this router however as I cant access the login on 192.168.0.1