Mac address question

[Caudex]

I have some software that will change the MAC address of my Linksys Ethernet card. There is a drop down list where you can select which devices MAC address you want to change. My Ethernet card is in there but, not my RCA cable modem.

My question is, can I be tracked by my cable modems mac address or just my ethernet card MAC address? I read something about the MAC addresses being married, I don't fully understand what that means? Does it mean that my cable modem's MAC address matches my ethernet cards address?

[LooseChippings]

As far as I'm aware Cable Modems don't have a MAC Address.

Only Network Interface Cards (NIC) and Routers have a MAC Addresses.