none
MS DHCP Server 2016 - Responding to DHCP Request w/ wrong scope RRS feed

  • Question

  • Community,

    We are encountering a strange issue where our DHCP server is responding to a DHCP request with an address offer in the wrong scope.

    Detail:

    Client connects to wireless in office A, SSID named "Primary" and gets a DHCP address from the central DHCP server of 10.1.1.101 via the local relay (office router 10.1.1.1)

    Client then puts the laptop into sleep mode and travels to another office (could be 45 minutes or 2 days later)

    The client connects to the same SSID "Primary" in office B and sends a DHCP request with option 50 requesting the same address it had previously: 10.1.1.101.  The relays address has changed though to 10.100.1.20 because the client is in a different office and is using a wireless controller as a relay.  The DHCP server responds to the client's request and gives it the old 10.1.1.101 address rather than issuing a 10.100.1.x address to match the relay's scope.

    Any ideas on what the issue could be?

    Thanks

    Thursday, November 1, 2018 2:25 PM

All replies

  • Hello JSH6117,

    Thank you for your question.

    The DHCP Option 50 is used to request a specific IP address. For example, if a client is disconnected, you might use this capability to assign the same address that the client was using prior to being disconnected. If the requested address is available, DHCP assigns it to the client. If the address is unavailable, the DHCP server offers another address, based on the address allocation process.

    Try to use " ipconfig /release " and " ipconfig /renew " to see if you can get IP address of 10.100.1.x.

    Best Regards,

    Leon


    Please remember to mark the replies as answers if they help and unmark them if they provide no help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Friday, November 2, 2018 7:00 AM
  • Hi,

    Just checking in to see if the information provided was helpful.

    Please let us know if you would like further assistance.

    Best Regards,

    Leon


    Please remember to mark the replies as answers if they help and unmark them if they provide no help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Wednesday, November 7, 2018 11:13 AM
  • Hi,

    Was your issue resolved?

    If you resolved it using our solution, please "mark it as answer" to help other community members find the helpful reply quickly.

    If you resolve it using your own solution, please share your experience and solution here. It will be very beneficial for other community members who have similar questions.

    If no, please reply and tell us the current situation in order to provide further help.

    Best Regards,

    Leon


    Please remember to mark the replies as answers if they help and unmark them if they provide no help.
    If you have feedback for TechNet Subscriber Support, contact tnmff@microsoft.com.

    Tuesday, November 13, 2018 1:29 AM