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  • DHCP Option 81

    Hi,

    Simple one but its annoying me... where is option 81 ? DHCP only appears to go upto option 76 ?
    Benjapos

    MCP 70-270, 70-290, 70-291 ITIL Practitioner, Prince2 Practitioner - working on 70-284

  • #2
    You'll find what you're looking for under the DHCP server properties.

    Originally posted by Technet
    DNS Dynamic Update Client
    Windows Server 2003 includes support for DNS dynamic updates as described in RFC 2136. Every time there is an address event (new address or renewal), the DHCP client sends option 81 and its fully qualified name to the DHCP server, and requests the DHCP server to register a DNS pointer (PTR) resource record (RR) on its behalf. The DHCP client handles the dynamic update of the address (A) RR on its own. This is done because only the client knows which IP addresses on the host map to that name. The DHCP server may not be able to properly do the A RR registration because it has incomplete knowledge. However, the DHCP server can be configured to instruct the client to allow the server to register both records with the DNS. Registry parameters associated with the DNS dynamic update client are documented in Appendix C.

    The Windows Server 2003 DHCP server handles option 81 requests as specified in the Internet draft titled "The DHCP Client FQDN Option" (draft-ietf-dhc-fqdn-option-0x.txt). If a Windows Server 2003 DHCP client obtains an IP address configuration from a down-level DHCP server that does not handle option 81, it registers a PTR RR on its own. The Windows Server 2003 DNS server is capable of handling dynamic updates.

    Statically configured (non-DHCP) clients register both the A and PTR RRs with the DNS server themselves.
    http://www.microsoft.com/technet/pro...ip03.mspx#EHAA
    Attached Files
    Andrew

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

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    • #3
      Thank you, so option 81 is the DNS tab of the DHCP server properties.
      Benjapos

      MCP 70-270, 70-290, 70-291 ITIL Practitioner, Prince2 Practitioner - working on 70-284

      Comment


      • #4
        Option 81 allows for dynamic updates of DNS records. The screenshot shows you where to enable that within the DHCP server.

        So to answer your question, yes.
        Andrew

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

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