GS can't connecting to LS using WAN IP

[maradhona]

game server can't connecting with login server, when i use wan ip..

i use 2 device in my net work:
1) modem tp-link for dialup from ISP
2) mikrotik router for connect to my LAN

and i put ip static to my LAN from mikrotik n (GW) 192.168.3.1

how to fix its..
thanks.

[MentaL]