How to forward port with two routers?

ive got a speedtouch 536 (modem) and a dlink dir300(wireless router), but when i try to forward ports it doesnt work, i got so frustrated that i took out the dlink wireless router, and guess what, the ports forwarded perfectly, how can i get the ports to forward while i have both connected? if any more info is... show more ive got a speedtouch 536 (modem) and a dlink dir300(wireless router), but when i try to forward ports it doesnt work, i got so frustrated that i took out the dlink wireless router, and guess what, the ports forwarded perfectly, how can i get the ports to forward while i have both connected? if any more info is needed just ask
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