Oh, and further more, it is usually best to have a DSL connection via a modem in bridge mode -- using a good firewall device. If you don't want a separate firewall device, then you can simply use the modem for DHCP purposes and the Linux side of things is as simple as plain old networking. There is none of this Windows vs Linux to be worried about. For 3G and 4G services, I usually recommend a dedicated modem/router device that supports Mobile Broadband using a USB stick -- for instance a box running ROOTer [1] (a version of DD-WRT), will be much easier to use than trying to get the 3G/4G modem stick operational directly on a Linux box. Besides, I am of the view that the public IP (or carrier grade NAT IP), should not be public facing directly on equipment that /may/ have any kind of vulnerable component -- that is especially true for Windows boxes, but it is also true for other OS (including Mac OS X) and of course Linux. [1] http://www.ofmodemsandmen.com/downloads.html Cheers A.