The reason for the 5 static bundle is because when you are using multiple devices such as modem AND router, each device needs an IP address. So the hitron will need an IP address (whether its static or dynamic) and the draytek will need one too. In this situation you wouldn't use the LAN DHCP settings on the Hitron, instead you would ask VMB

However, Vigor Router supports “Bind-IP-to-MAC” which allows Network Administrator to reserve an IP address for certain MAC address and exclude the IP address from the IP pool; on the other hand, the device of certain MAC address will always obtain the reserved IP address., therefore can get a fixed IP address through DHCP. DRAYTEK Default Router Login and Password Find the default login, username, password, and ip address for your DRAYTEK router. You will need to know then when you get a new router, or when you reset your router. Vigor Router VFAQ - DrayTek

Setting up port forwarding on a Draytek router

How to Port Forward a Draytek Router | Support | No-IP Step 1: Login to the Draytek router via the default gateway address. Step 2: Click on “NAT” and then “Port Redirection.” Step 3: Click on “1.” Step 4: Click “Enable.” Set the Mode to “Single.” Enter a Service Name, Public Port, Private Port and Private IP. Set the Protocol to “TCP” and WAN Interface to “All.” Setup and Configure Dynamic DNS in a Draytek Router - No-IP

Sep 01, 2012

I have a Draytek Vigor 2820 router which is connected to our ADSL provider (British Telecom, BT). We currently have one static IP address which is accessible from anywhere outside of our network and points at a simple web server on port 80.