> Often, once the cable company sees a MAC address, it filters all > other MAC addresses from getting a lease from your wire.
This is true, broadly speaking. If they're mildly clueful (and probably if you convince them that you are), you may be able to get them to either add multiple MAC addresses for your account or simply relax the "single MAC" restriction if you explain that you're experimenting with new equipment/configurations you wish to use, and will be swapping equipment in and out (this is probably more likely with a static IP, natch). At least for some services, it's merely your local equipment that's caching the MAC address - e.g. for RoadRunner service, you can simply switch off the cable modem long enough to let the caps discharge completely (~30-45 seconds) and switch it back on, and it'll be happy with whatever it "saw" on it's ethernet port when the 10/100 link comes up, but you can't hot swap routers or firewalls and expect it to work - the link will come up, but the cable modem will be "deaf".. :) HTH. Cheers, AS
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