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Windows Server 2008 R2 Thread, Reserve ip issue in Technical; Hello, At this moment, there's two dchp servers running on the same LAN but different on ranges. On the 2k8 ...
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    Reserve ip issue

    Hello,

    At this moment, there's two dchp servers running on the same LAN but different on ranges. On the 2k8 machine, I enabled the DCHP server and add one reserved ip from one of test workstation's. After I added it in the reserved list and did a release /renew command and in the reserved list still show inactivate plus the workstation's ip haven't change to the desired ip.

    What did I miss?

    Here's the basic lan's ip below.

    1) Router - Range -> 10.210.2.120 to *.254


    IP Address : 10.210.2.1
    Subnet Mask : 255.255.255.0
    Primary DNS Server : 208.67.222.222
    Secondary DNS Server : 208.67.220.220


    2) 2k8 R2 -Range -> 10.210.2.30 to *.110


    IPv4 Address. . . . . . . . . . . : 10.210.2.7(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Default Gateway . . . . . . . . . : 10.210.2.1
    DNS Servers . . . . . . . . . . . : 127.0.0.1
    NetBIOS over Tcpip. . . . . . . . : Enabled

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    Duke5A's Avatar
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    Your workstation is probably getting a DHCP reply from the router first. There is no way to specify on the workstation what DHCP server to use; it's simply whoever replies the fastest. What you should do is add the workstation's MAC address to a deny list on the router. This way the router will not respond to DHCP requests from the workstation and it will be forced to get an address from the 2k8 server.

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    Quote Originally Posted by Duke5A View Post
    Your workstation is probably getting a DHCP reply from the router first. There is no way to specify on the workstation what DHCP server to use; it's simply whoever replies the fastest. What you should do is add the workstation's MAC address to a deny list on the router. This way the router will not respond to DHCP requests from the workstation and it will be forced to get an address from the 2k8 server.
    Looks like it but I have over 70 nodes and don't want to add each mac address into the filter list. Plus there's no clickable feature to add into the filter list as well. So I'm going to disable the router's DHCP and let 'em go the server box.

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    Quote Originally Posted by Duke5A View Post
    Your workstation is probably getting a DHCP reply from the router first. There is no way to specify on the workstation what DHCP server to use; it's simply whoever replies the fastest. What you should do is add the workstation's MAC address to a deny list on the router. This way the router will not respond to DHCP requests from the workstation and it will be forced to get an address from the 2k8 server.
    Ok; this is kinda new to me that there wouldn't be a dual DHCP on the same LAN. I have about over 70 nodes and wouldn't want to reserve each machine! What I am trying to get nodes to point to server box so I can add the reserve ip by using context menu in the address leases but the problem still occurs so here's what I did below. Correct me if I did something wrong.

    1) Disabled router's DHCP

    2) Enable Server's DHCP with forwarders of opendns' numbers -> 208.67.222.222, 208.67.220.220

    3) Workstation - got the ips from server but NO INTERNET. I don't see DNS of opendns but server's.

    The workstation still wouldn't get online expect the server. Please take a look at it again and see if I miss anything. (Getting very frustrating!)

    Server:

    Connection-specific DNS Suffix . :
    Description . . . . . . . . . . . : Broadcom NetXtreme Gigabit Ethernet
    Physical Address. . . . . . . . . : 00-26-B9-82-8E-B2
    DHCP Enabled. . . . . . . . . . . : No
    Autoconfiguration Enabled . . . . : Yes
    IPv4 Address. . . . . . . . . . . : 10.210.2.7(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Default Gateway . . . . . . . . . : 10.210.2.1
    DNS Servers . . . . . . . . . . . : 127.0.0.1
    NetBIOS over Tcpip. . . . . . . . : Enabled

    Workstation:

    Ethernet adapter Local Area Connection:

    Connection-specific DNS Suffix . : macserv.local
    Description . . . . . . . . . . . : NVIDIA nForce Networking Controller
    Physical Address. . . . . . . . . : 00-E0-4C-EA-1B-F6
    DHCP Enabled. . . . . . . . . . . : Yes
    Autoconfiguration Enabled . . . . : Yes
    Link-local IPv6 Address . . . . . : fe80::9590:e3b3:2634:2792%11(Preferred)
    IPv4 Address. . . . . . . . . . . : 10.210.2.30(Preferred)
    Subnet Mask . . . . . . . . . . . : 255.255.255.0
    Lease Obtained. . . . . . . . . . : Tuesday, March 05, 2013 9:20:37 AM
    Lease Expires . . . . . . . . . . : Wednesday, March 13, 2013 9:20:36 AM
    Default Gateway . . . . . . . . . :
    DHCP Server . . . . . . . . . . . : 10.210.2.7
    DHCPv6 IAID . . . . . . . . . . . : 234938444
    DHCPv6 Client DUID. . . . . . . . : 00-01-00-01-17-0F-8D-96-00-E0-4C-EA-1B-F6
    DNS Servers . . . . . . . . . . . : 10.210.2.7
    NetBIOS over Tcpip. . . . . . . . : Enabled

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    Just solved a problem with a help from someone.
    What we did;

    Configured the DHCP scope to include the gateway of 10.210.2.1 in the setting of Scope Options. Appears I didn't add that during the first DHCP setup. Thanks for trying to help.

    Please lock this thread.

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