hmmmm ... maybe this should be in the Hardware Forum, anyway a Mod can change that.

Linux 9 ? .... not one I have heard of before but that shouldn't matter, your post does not give me enough information to really help but I will give it a go.

Is the modem a USB or ethernet connection, D-Link make both I believe ? .. if USB have you got USB support going in your distro ? I have no knowledge of USB modems, so I cannot offer any advice here.

If an ethernet connection - install pppoe and on the commandline type 'adsl-setup' - answer the questions and when done type 'adsl-start' ... hopefully your online.... unless its one of the router type ones where you use a web browser to set everything in the modem/router itself ... you do have the intruction manual I hope, if not the D-Link web site has data sheets / manuals to help.

Like I said, not enough information to be much help.