Cant disable NAT

I have an Edimax BR6524n router.
I used to have an older Edimax which it replaced.
I have in the LAN computers with real static IP addresses (one of them a server) which are supposed to reach the internet directly.
I tried adding the server to the DMZ (with the same address in client and external IP) and adding static routing, but every time I check "whats my IP site" from one of the computers - it is the routers external IP.
I tried the following:
LAN IP - ***.***.241.128
Mask - 255.255.255.248
Gate way - ***.***.241.129 (the LAN IP given to the router)
Still doesnt work. The server (****.***.243.131) is not visible from outside.

Any ideas (apart of the obvious "dont buy Edimax next time")?

THANKS!