Take the 2-minute tour ×
Information Security Stack Exchange is a question and answer site for Information security professionals. It's 100% free, no registration required.

Is a DOCSIS modem only authenticated by the CMTS by a MAC address or are there any other AAA techniques? In that case, how do I prevent other customers from spoofing my modem's MAC address?

  • Cable Modem Initialization Wallchart published by Cisco in 2005:


share|improve this question

1 Answer 1

up vote 0 down vote accepted

MAC address spoofing is possible, but a) requires knowledge of existing, valid, not used MAC address b) tools - not that widely available for cable modems as for ethernet routers.

Certificate based authentication and encryption is available (Baseline Privacy Inteface Plus - DOCSIS 1.1 and DOCSIS 2.0, Security in DOCSIS 3.0) - see http://bit.ly/1iJMbNM for some more details.

share|improve this answer

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.