Draytek Vigor2500V Manual page 57

NAT
You follow the path Internet Access>>PPPoE/PPPoA if your ISP offer you
with PPPoE or PPPoA:
When you click the WAN IP Alias button, it will show up a window for you to
set your public IP addresses, as shown below. After set the public
addresses in the appropriate boxes, you shall check Join NAT IP Pool to let
your network client to use these public IP addresses to communicate outside
world. i.e. you can specify one computer to be your web server for showing
your personal data when you would like to make friends. Furthermore, you
can assign another public IP addresses for your kids to participate in the
distance learning over Internet.
After you enter some of your public IP addresses into the WAN IP Alias
(Multi-NAT) menu, these addresses will then be selectable on either the
NAT/Open ports menu or the NAT/DMZ menu.
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