Louie,
I've always said it's a bad idea to try to run a hosting company from home on an ISP or cable connection.
And the best place for you to get information is, of course, your cable provider.
Now, that said, let me respond to the rest of your email...
My ISP just informed me today that they (a cable company) assign static IP addresses dynamically by MAC address.
Dynamically, eh? Then they're not really static IP#s. SBC has recently started doing this; they call it "sticky IP#s", and it's what they're now assigning in San Bernardino, Calif., though their website still says "Static IP".
But if they're doing it the same way I'm seeing it done by SBC, then you can't connect your linux server directly to the Internet with a standard static IP configuration; you'll need either a router, or to set up PPPoE on your linux box. And you can't run DA on multiple IPs over PPPoE because DA doesn't know how to set up additional IPs over PPPoE.
Unless you get a router. SBC is charging $199 for a router worth at most $75.
Though I host from one of the best data centers in the world (it even hosts one of the main DNS root servers), I use SBC at home and for my testbed DA server. Supposedly (or so I've been told) our account qualifies as a "legacy" account and we will continue to have true static IP#s. If that ever stops, then we will have to leave SBC.
I told them that I need multiple IP's on one physical interface (for my DA server) and he said that they can't do that.
As I wrote above, DA can't do it even if they can, unless you can get a router that you can use to log in over PPPoE (and only if they support it, which they say they don't). So if they say they can't, they probably can't.
However, if been speaking only with first level support, be sure to ask for "second level" or "top level" support; it's been my experience in the past that first level support people often have mistaken impressions of what they can and can't do.
Is he right? Has anybody ran across this problem?
We ran across it one time with SBC, last week, for a friend who wanted to host a webserver. He's not using DA, and he's going to get around it (when he needs more IP#s), by getting the router from SBC.
Am I up a creek without a paddle?
Very likely, unless your area offers a satisfactory DSL connection; DSL providers are more apt to be able to handle multiple static IP#s. Of course unless you're in SBC territory
.
You might look to see if
Covad service is available at your location. They're considerably more expensive (though they're less than what I pay for the same service) but their 5 IP option might be just what you need.
If you tell me your cable provider I might be able to get a definitive answer for you.
Jeff