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DHCP reservations falling outside of scope they are reserved in RRS feed

  • Question

  • Hi,

    I have a scenario where DHCP Server is installed on Server 2012 R2.  I have various DHCP Scopes setup for Citrix VDA Servers.  The server has reservations in the required scope to assign the specific addresses but these reservations fall outside of the scope they are reserved in. e.g. the scope would be xx.xx.xx.10 to xx.xx.xx.11 and we could have dozens of reservations that call between xx.xx.xx.10 and xx.xx.xx.200.  I realise that exclusions could be used to prevent this from happening but wanted to understand the root cause?

    I also noticed that this wasn’t actually possible in Server 2008 R2 https://support.microsoft.com/en-gb/kb/2005980 and was wondering if this is a fully supported configuration with Microsoft or if there are pitfalls using this configuration longer term? 

    Thanks

    Tuesday, May 3, 2016 9:13 AM

Answers

  • Hi Phil,

    I tested it in my lab.

    Scope:10.10.0.0/23

    Adress pool:10.10.0.11-10.10.0.100

    Reversations:10.10.1.1

    It works.

    >>I also noticed that this wasn’t actually possible in Server 2008 R2 https://support.microsoft.com/en-gb/kb/2005980 

    I don't find any about this for 2012.

    You can create a reservation in a subnet range even if the reservation falls outside the address pool.Please check the scope and subnetmask.Make sure the reversation was belonged to the scope.

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    Cartman
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    Wednesday, May 4, 2016 5:44 AM