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  • MAC address over ISP

    Re - reading through the Network + book on the OSI model I would be interested to know how the Cable companies knew the MAC address of your gateway;

    The MAC address is at Layer 2 and IP is at Layer 4. I assume the Cable concept is different to DSL?

    I know this method of authentication (in the UK) has gone but would be interested if anyone does know.

  • #2
    Re: MAC address over ISP

    I assume when you first enter your authentication, it broadcasts it and the server learns your MAC address (like DNS and ARP)
    Tom Jones
    MCT, MCSE (2000:Security & 2003), MCSA:Security & Messaging, MCDBA, MCDST, MCITP(EA, EMA, SA, EDA, ES, CS), MCTS, MCP, Sec+
    PhD, MSc, FIAP, MIITT
    IT Trainer / Consultant
    Ossian Ltd
    Scotland

    ** Remember to give credit where credit is due and leave reputation points where appropriate **

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    • #3
      Re: MAC address over ISP

      Tom,

      Thanks for your reply.

      I assume the cable companies modem doesn't function in the conventional way of dropping Layer 2 or lower as the conventional TCP with DSL.

      Simon

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      • #4
        Re: MAC address over ISP

        little correction, IP is layer 3, TCP is layer 4
        further i think that Ossian is right...
        Marcel
        Technical Consultant
        Netherlands
        http://www.phetios.com
        http://blog.nessus.nl

        MCITP(EA, SA), MCSA/E 2003:Security, CCNA, SNAF, DCUCI, CCSA/E/E+ (R60), VCP4/5, NCDA, NCIE - SAN, NCIE - BR, EMCPE
        "No matter how secure, there is always the human factor."

        "Enjoy life today, tomorrow may never come."
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        • #5
          Re: MAC address over ISP

          Originally posted by Dumber View Post
          little correction, IP is layer 3, TCP is layer 4
          Thanks for the correction.

          Simon

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