Had a look at the post and it did not work for me.
So I spent 85 minutes on the phone with Virgin media who insisted that I need to reset my router even although I have done this many times I am now the proud owner of an old hub 3 and all my port forwarding rules are complete and both of my servers can do the job they were designed to do.
Shame on virgin media for pushing a product on customers with so many flaws.
Great if you want plug and play out the box but if you need to add manual port forwarding rules then ask for a hub 3 it works