Port forwarding with a router and a modem?

Hello everybody. A while back I purchased a Dlink modem to use with my shitty SMC router that my ISP gave me. I need to use the SMC and before I got the dlink I could port forward and game just fine. I have the SMC in bridge mode and I have tried forwarding my ports on The dlink and the smc, just the smc, just the dlink and nothing has worked. If somebody could tell me how I can get a minecraft server up on my network I would be extremely grateful.

Are you making firewall exceptions for the server(s) you are trying to run on your computer in addition to these measures you've tried? If you successfully forward ports it will have been for nothing if your firewall is blocking access to whatever server you are trying to run.