@terziyski k. I get somewhat what you are saying. (only cus I don;t have network knowledge to understand NAT, etc.. but I get general meaning) So is WR840N assigning different IP address than primary...

Should DHCP ON? or OFF? I am using WR840N as secondary router to my main modem/router(Primary) from ISP. I always thought that only primary router should have DHCP ENABLED, and any secondary router...