Unsupported: Cable modem

Pages in the unsupported: namespace are intended to deliver general information about an “unsupported” status. They should help users to better understand the reasons and the consequences of this “unsupported”.

Since these pages can be reached via a dataentries of very different devices, the descriptions should be of general nature, or cover all the different devices affected by this “unsupported”. They shall not describe any device specifics.

  1. What does it mean, “Cable modem is unsupported”?
    • This means that the cable modem will not work, you can not use your device with OpenWrt as a cable modem.
  2. What is the reason for the unsupported status?
    • DOCSIS functionality is based on cryptographic certificates to authenticate cable modems and their running firmware to the ISP - that is not supportable by OpenWrt under any circumstances.
    • There is no FOSS solution available for cable modems.
  3. What consequences does this have in regards to your expectations?
    • Expectation: Fully working cable (DOCSIS 3.0/3.1) modem
    • Reality: You can not use the cable modem part of your device in any way.
  4. Will this status change over time? If yes, in what timeframe?
    • No, hell freezes before that happens.
  5. What can you do now?
    • In case of internet via cable you'll have to use dedicated cable modem in double NAT or bridge mode (as long as your ISP allows that), with an OpenWrt device between it and your local network to act as router/firewall

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  • Last modified: 2024/02/12 11:43
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