Actually, I posted here because I e-mailed TPG, the isp in question, and they said that the d-link modem wasn't supported. Also, I just looked on the HCL for the Netcomm Modem/Router, and it isn't there either, another netcomm modem is. So I might be screwed no matter what modem I choose.
Also, I did a search in the forums, and it turns out that a SUSE user had luck with his d-link modem, another model though, by configuring his network with dhcp. Any chance that approach would work for me in Mandrake?