与其他子网中的服务器通信

I have a router MW301R Mercusys that is connected to a ADSL modem with the IP 192.168.1.54 in the WAN. In this subnet 1.* I have a Samba server . The problem is that when the DHCP server assigns IPS its in the subnet 0.* Subnet not in the 1.* I know that WAN subnet cannot be the same that LAN, but what can I do, to solve this problem? How can I connect to a server in a different subnet ?