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Thread: WDS 2008, DHCP, multiple VLANs, DHCP Relays, help! :-)

  1. #1
    Brian Day Guest

    WDS 2008, DHCP, multiple VLANs, DHCP Relays, help! :-)

    Hi,

    I'm configuring a Windows Deployment Services 2008 server and it will also
    house the DHCP role to be used. The servers who will be using this WDS
    service reside on a couple different switches (trunked together), on
    multiple VLANs, on multiple subnets.

    My desire is that each server while PXE booting will receive a DHCP address
    from a DHCP scope dedicated to the subnet it belongs to, which is defined by
    what VLAN the switch port is on. They'll use this IP during deployment and
    then we'll statically assign an IP when the deployment is complete.

    My original thought was to place the NIC in the WDS server on a modified
    trunk port allowing all required VLAN IDs for the servers to traverse it and
    then find a way for DHCP to respond with a proper scope depending on which
    VLAN the request came over. The more I look into it, the more this looks
    like a horrible and difficult idea. :-)

    Can some of you offer your opinion if a DHCP relay is instead a better
    solution? How will the DHCP server know which scope to assign when receiving
    the DHCPREQUEST message?

    Thank you!



  2. #2
    Phillip Windell Guest

    Re: WDS 2008, DHCP, multiple VLANs, DHCP Relays, help! :-)

    "Brian Day" <bdaytech@verizon.net> wrote in message
    news:F32BF7B3-2439-4C6A-9B11-C54508471056@microsoft.com...

    > How will the DHCP server know which scope to assign when receiving the
    > DHCPREQUEST message?


    The DHCP Relay is a fuction of the LAN Router. That is what Routers do.
    The Router knows what it is doing with that. The required information is
    included in the relayed packets.

    There is nothing on the DHCP Server or the Client that has anything to do
    with the "relay" and if it succeedes or fails. DHCP Service just needs to
    have a valid Scope for each segment (No Superscopes!)

    --
    Phillip Windell
    www.wandtv.com

    The views expressed, are my own and not those of my employer, or Microsoft,
    or anyone else associated with me, including my cats.
    -----------------------------------------------------



  3. #3
    Brian Day Guest

    Re: WDS 2008, DHCP, multiple VLANs, DHCP Relays, help! :-)


    "Phillip Windell" <philwindell@hotmail.com> wrote in message
    news:Om4lYdAlIHA.6032@TK2MSFTNGP03.phx.gbl...
    > "Brian Day" <bdaytech@verizon.net> wrote in message
    > news:F32BF7B3-2439-4C6A-9B11-C54508471056@microsoft.com...
    >
    >> How will the DHCP server know which scope to assign when receiving the
    >> DHCPREQUEST message?

    >
    > The DHCP Relay is a fuction of the LAN Router. That is what Routers do.
    > The Router knows what it is doing with that. The required information is
    > included in the relayed packets.
    >
    > There is nothing on the DHCP Server or the Client that has anything to do
    > with the "relay" and if it succeedes or fails. DHCP Service just needs to
    > have a valid Scope for each segment (No Superscopes!)



    Thank you, Phillip, I had read that but it seemed too easy to be true. :)
    I'll work with my network team to get this configured. Thank you very much.


  4. #4
    dennyd Guest
    You don't need to do anything on the DHCP Server except create the scopes. You do need to set IP helper (Windows Admins call this DHCP relay) on your switch. IP helper helps forward DHCP discover packets to right DHCP server.

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