Hub One VPN issues

[#1]

Ok, may be a dumbass question but what is this setting for on the Hub One router:

Advanced Settings > VPN

I know what a VPN is and actually use one but I am at a loss as to what to configure/setup in this menu option.  Anyone got any ideas?

Cheers

[#2]

No ideas anyone, not even PlusNet? 

[#3]

Doesn't the built in help on the Hub One describe what this does?

[#4]

No, that's why I am asking on the forum.  Also, PN Tech (hmm) haven't got a clue either 😕

[#5]

I remember seeing a brief description of what it did somewhere but I thought it was in the built in help.

[#6]

Yep, that's all you get.  So, what Port does it use (presumably 1723) how do your Forward the 'VPN' to a nominated device (presumably via Firewall) are there any other setting we should be a aware of?

I ask because I have a VPN inbound on Windows 10 (that did work with my TP Link) that doesn't with the H1... 😕

TIA

Paul