I can answer the first part of your questions, up to the NIC, but not beyond.
On my residential Shaw, I have had 3 IP addresses (all 3 dynamic, but they rarely change) for several years now. The first one was of course included in the service, the second one was available for free just for the asking (subject to availability in the
area, they said), and the third one is costing $10 per month.
I wish you had told us which model of Shaw modem-router you have. Here's the 4 common ones they've issued over the last number of years:
2. Hitron CGNM-2250.
3. Cisco/Motorola DPC3848V.
4. That funny-looking new contraption that promises to reach every corner of your house and your cranium with deep penetration.
Details:
1. Cisco DPC3825. A complete piece of junk, designed by a company that Cisco then bought so that they had something to sell to carriers for their lowest-priced plans. It does support "bridge" mode, but only on an all-or-nothing basis for the
whole box, not per RJ-45 socket (4 of them). "Bridge" mode is the only way people get this junk to work somewhat reasonably.
4. That funny-looking new contraption. I have no idea about this one, but I wouldn't want my remaining brain cells to be destroyed this way.
3. Cisco/Motorola DPC3848V. Well-regarded, and I THINK it works the same way as #2 below.
2. Hitron CGNM-2250. A top-notch gem, which I've been using for several years now. It does support "bridge" mode, aka IP pass-thru, on a per RJ-45 socket (4 of them) basis. Its (Web) config lets you configure that, along with loads of other parameters (most
of which don't apply to IP pass-thru sockets). The raw (non-NAT'ed, non-firewalled) IP addresses coming out of the chosen pass-thru RJ-45 sockets are fit to send into SEPARATE routers or SEPARATE NIC's, and the non-pass-thru RJ-45 sockets (if any) remain
as NAT'ed/firewalled sockets, along with the Hitron's own Wi-Fi output.
Now, back to Shaw. You need to request the second (and beyond) IP's explicitly, otherwise #2 above will NOT work as described. Once you do have the second (and beyond) IP's, the Hitron nicely distributes them as above. Even if all 4 RJ-45 sockets are configured
as IP pass-thru, though, the Hitron might still retain one IP to service its own Wi-Fi, perhaps even if you turn off Wi-Fi in its config - I'm not sure about this part.
As for two IP's to one NIC, I have no idea. Hence my comment right at the beginning, along with my emphasis on "SEPARATE routers or SEPARATE NIC's".
Hmmm, now all I have to do is remember why I need 3 IP addresses at Shaw.
🙂
Hartmut W Sager - Tel +1-204-339-8331