Sharing Internet

i don't know really how to share internet using router DLINK 615, all i know i have do but the result still nothing. its job make me crazy..

the conection is like this

ISP 3Gnet ----> Spliltter/Modem ----> Router Dlink 615 ----> clients

I got IP Address from ISP is

• IP =192.168.x.x
• SM=255.255.255.252
• GW=192.168.x.x
• DNS1=xxx.xxx.xxx.xxx
• DNS2=xxx.xxx.xxx.xxx

to setup router for internet conection i filled with static IP and filled like the above

and to setup the NETWORK

• IP=192.168.01
• SM=255.255.255.0

and for the wireless i setup just like usual and i think it doesnt make problem

i did just like the above of setting its router..the result the internet doesnt want to connect ...but sometime its working but its not get stabil. i am really stuck on this problem so i decided to using PC desktop for proxy GW n internet sharing is working..

ISP/modem---->> PC desktop gateway---> router wirelless--->clients

but here i still wonder why if im using router internet sharing doesnt working...??

anyone wanna help me?