Model : TL-WR840N

Hardware Version : 4

Firmware Version :

ISP : STC

Dear Everybody.

am here to ask you guys something i could not find on the internet.

i bout a new Wireless N Router TL-WR840N,

i want to use is as Wireless Router with LAN, (Means i want to use WiFi + LAN)

2nd thing is i have a small network setup also with manual IP (Differ from Default)
means default IP was (192.168.1.1 of my modem but i changed it to 192.168.0.100) and my server has the same range of IP: 192.168.0.11 and Printers alos: 192.168.0.250-144)

now my problem is i could not get the same range of IP from my TL-WR840N Router...

am changing IP to my own (192.168.0.200) but when i connect the WAN cable it becomes again to the default (192.168.1.1) or give me an error (The LAN IP should not be the same subnet with WAN IP, Please input another one.

Please let me know the solution if you guys got my point.

sorry for my bad English.

Thanks in advance.

Awaiting for your earlier & Positive reply.