VPN Passthrough with MN-700

Hi,
I am to establish a VPN connection through an MN-700. I
found a KB article for a Cisco client that says I need to
set the DHCP range to 192.168.1.x. Do I need to do this
for all clients? I have a (Netcomm VPN-100 client).

Is there anything I need to configure, or is passthrough
enabled by default?

I cannot get the connection established and cannot work
out if the router is interferring.

Thx

Bryon