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  • DHCP option 82

    Hi,
    I'm new here so apologies if this sort of thing has been asked before. I have tried searching through the existing dhcp server posts to see if this is the case but didn't find anything similar to my question. Any help or "pointing in the right direction" that can be provided would be gratefully appreciated.

    I have a requirement at work to enable and be able to utilise DHCP option 82 information. I was wondering if the following scenario can be achieved?

    We have Alcatel switches with option 82 enabled, and we need a small subnet of hosts connected to a switch to be able to be assigned dhcp IP addresses based on port location. As an example...we need host X to be able to plug into port Y on the switch, and for a win 2003/2008 dhcp server to allocate an IP to that port and the host. Then if host X disconnects and host Y plugs into the same port, we need dhcp to assign the same ip it did previously to the new host...so in essence a dhcp ip address that is fixed to the switch port.

    Is this possible to achieve from anyones experience, based on what can be done with option 82, or is there another easier way to achieve what we need? I appear to be going round in circles with my research, and indeed seem to be reading that option 82 utilisation is not something that windows dhcp can really do. I've also read that linux ISC dhcp server can log and use option 82 information, but again I'm not sure if that information can then be used in the way I have described.

    If anyone can shed any light on the subject, even a simple 'yay or nay' it would be helpful.

    Thanks in advance

    TM

  • #2
    Re: DHCP option 82

    DHCP uses broadcasts and cannot be tight to a switchport.
    Would be a bad design though and defeats the use of DHCP. I believe option 82 is for DHCP relay agents anyway..

    oh check this; http://www.odva.org/Portals/0/Librar...ption_82v2.pdf
    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."
    "If you're going through hell, keep going. ~Winston Churchill"

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    • #3
      Re: DHCP option 82

      Ok...thanks Dumber for the reply and clarification.

      Regards TM

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