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.

We have just been given 5 more static IP addresses which I would like to point at five servers that have static IP's.

As an example:

Current static IP -      80.123.123.123
New Static IP's   -      100.100.100.100-105


Server IP's       -      192.168.1.129-133

I have confused myself completely between NAT addresses, static routes and WAN IP aliases. If anyone can give me a clear idea of what I need to do it would be greatly appreciated.