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DHCP Reservation Inactive HELP

    Question

  • Dear All,

    I just joined two new 64bit Win 7 PC to our WIN2K3 domain. I gave them static IP etc and set up reservations in DHCP via the correct MAC address. I can ping both machines and they function fine. The problem is they are shown in DHCP as inactive.

    How can I get them to show as active. I tried letting the server issue the IP addresses and then just used those, but the same problem exists.

    Please can a kind sole help me out>?

    Thank You

    EN4

    Saturday, January 04, 2014 12:44 PM

Answers

  • Hi,

    In order to get the reservations in the DHCP server to be shown as Active, the machines you've assigned reservations for need to use DHCP for ip address assignment (not static ip).

    It looks like you already tried that, but if you change to DHCP on those clients, run 'ipconfig /release' and 'ipconfig /renew' on the machine, after a refresh in the DHCP console, they should show up as Active if all is configured OK.

    Read more about DHCP reservations here:

    http://technet.microsoft.com/sv-se/library/cc779507(v=ws.10).aspx


    MCT | MCSE: Private Cloud/Server, Desktop Infrastructure


    Saturday, January 04, 2014 12:53 PM
  • If you want the clients to keep the same ip address every time they request a new lease, and run DHCP on the client, you need to keep the reservation on the server, AND change from static ip address to dynamic address on the clients.

    If you instead want them to have static ip addresses, you can easily put them outside the dhcp scope in the subnet (eg. if you have 50-150 in your scope, you assign ip 160 and 161). You can also create exclusions for certain addresses within the scope as in this article: http://technet.microsoft.com/sv-se/library/dd894450(v=ws.10).aspx 


    MCT | MCSE: Private Cloud/Server, Desktop Infrastructure

    Saturday, January 04, 2014 2:25 PM

All replies

  • Hi,

    In order to get the reservations in the DHCP server to be shown as Active, the machines you've assigned reservations for need to use DHCP for ip address assignment (not static ip).

    It looks like you already tried that, but if you change to DHCP on those clients, run 'ipconfig /release' and 'ipconfig /renew' on the machine, after a refresh in the DHCP console, they should show up as Active if all is configured OK.

    Read more about DHCP reservations here:

    http://technet.microsoft.com/sv-se/library/cc779507(v=ws.10).aspx


    MCT | MCSE: Private Cloud/Server, Desktop Infrastructure


    Saturday, January 04, 2014 12:53 PM
  • Thanks you Johan, that explains it.

    So, what I really need to do is remove the two said static IP addresses from the ones in the DHCP address pool . Is that correct?

    or, as I only have 6 other clients on this small network and the two static IP addresses are higher up in the address range, are they unlikely to get issued?

    Finally, will it hurt if I am to leave both the IP addresses as reserved in DHCP even they are showing inactive?

    Thanks again for your time.

    EN4

    Saturday, January 04, 2014 2:20 PM
  • If you want the clients to keep the same ip address every time they request a new lease, and run DHCP on the client, you need to keep the reservation on the server, AND change from static ip address to dynamic address on the clients.

    If you instead want them to have static ip addresses, you can easily put them outside the dhcp scope in the subnet (eg. if you have 50-150 in your scope, you assign ip 160 and 161). You can also create exclusions for certain addresses within the scope as in this article: http://technet.microsoft.com/sv-se/library/dd894450(v=ws.10).aspx 


    MCT | MCSE: Private Cloud/Server, Desktop Infrastructure

    Saturday, January 04, 2014 2:25 PM