You owe me one… The MAC address on my SB2100D cable MODEM is on a sticker on the back of the MODEM... If the sticker is missing and the ISP needs the MAC address to turn-on cable Internet service, try this:
I turned-off and disconnected everything from my SB2100D cable MODEM, SMC Barricade router, cable, phone line (it is a one-way cable system with a dial-up uplink) and let is sit for several minutes. I then connected my PC directly to the cable MODEM and turned on the cable MODEM. I did not reconnect the cable and phone line. I shut-down and power-cycled my PC, ran Start, Run, winipcfg, and released and renewed the IP address. It picked-up192.168.100.x. I then opened a DOS Window and typed:
The MAC address for IP 192.168.100.1, the cable MODEM, was then displayed.
Let us know if this works for you, OK? Larry