From: Graham Trott [mailto:gt@pobox.com] Well answered. To which I'd add that low-cost modems don't offer a lot of flexibility. They may be fine for dynamic IP but with static you usually want more control than they offer.
Hmmm, I think the complete opposite of this an adsl router will give you less flexibilty than an adaptor (either usb pci etc.) directly into a linux box. With a linux box acting as a router you can do *anything* you wish with the static ip that you are given such as run any kind of VPN you like and enjoy the far more advanced Linux firewall options. If you have to have connections natted through the router then you lose lots of the flexibility you get from having static ip addresses.
Adam