Configuring public static IP on LAN server

Hello,

Here is what we have:

• DrayTek 2925 Vigor Router using a dynamic IP from ISP
• switch connected to router via LAN1. And is used for a couple of servers, wifi routers, and hardwired computers.
• ISP assigned single static IP, gateway, subnet mask, DNS(x2)
  

The two servers are Linux, if that matters (I've read that I should not configure the static IP on them but rather in the router). One should have outgoing connectivity, and connectivity with all other devices on LAN (server^X) and the other (server^Y) needs to be accessible from outside the internal network via the static IP. For the life of me, I cannot get the server to respond via the static IP. I have contacted the router's support which had me doing things I had already tried (VLAN, IP Routed Subnet).

DrayTek

Switch

server^X - local access only
server^Y - desired to have outside access via static IP
other devices

Questions:

• Is what I am trying to do going about things wrong? If so, how should I be doing it?
• Do I need to do anything on the server^Y for the static setup?
• Can I use a static IP on LAN even though the WAN connection is dynamic?

Other things:

• router info
• Web Interface