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DHCP Scope Setup RRS feed

  • Question

  • Currently the DHCP Server is not completely setup to what we need.

    EX: 1-Scope for Wireless = Range 10.2.0.0 / Range 10.2.20.1-10.2.23.254 Subnet 255.255.0.0

    I would like to setup a separate scope for Hard Wire Workstations - EX: 10.2.77.0 / Range 10.2.77.1-10.2.77.254 Subnet 255.255.0.0

    However I get the following message:

    "The address range and mask conflict with an existing scope."

    I searched for answers, but nothing is helping.

    Thank you all in advance.

    Thursday, October 27, 2016 7:06 PM

Answers

  • You want to create 2 DHCP Scopes using the same Subnet

    10.2.x.x and 10.2.x.x with a 255.255.0.0 as subnet.  You will not be able to do that.  There is an overlap.

    You will have to change one of the subnet for another.  If you need to keep a /16 subnet, then change the subnet of the Wired or Wireless for let say 10.3.0.x and keep the other for 10.2.x.x.


    This posting is provided AS IS without warranty of any kind

    • Marked as answer by CFSD6 Friday, October 28, 2016 3:26 PM
    Thursday, October 27, 2016 7:13 PM
  • New DHCP scope you mean?

    if there is DHCP clients, yes


    This posting is provided AS IS without warranty of any kind

    • Marked as answer by CFSD6 Friday, October 28, 2016 3:26 PM
    Thursday, October 27, 2016 8:46 PM
  • well...

    if you have 10 sites where each site gas it own subnet

    ex: 10.2.3.0 /24 ; 10.2.4.0 /24 and so on, yes you need a DHCP scope per subnet.

    For the gateway, each scope will have it's own gateway and you should get this information from your network team


    This posting is provided AS IS without warranty of any kind

    • Marked as answer by CFSD6 Friday, October 28, 2016 3:27 PM
    Thursday, October 27, 2016 10:36 PM
  • Thank you again - you are giving me great information.

    Okay here is what they got - a DC in each building running its own DHCP and networked throughout the LAN to each other with each having its own scheme such a:

    Building 1 = 10.2.0.1/24

    Building 2 = 10.3.0.1/24

    Building 3 = 10.4.0.1/24

    Building 4 = 10.5.0.1/24

    So I understand, I will need to create a separate scope for each building like - 10.20.xxx.xxx for Building 1 and so forth?

    • Marked as answer by CFSD6 Friday, October 28, 2016 3:27 PM
    Thursday, October 27, 2016 10:52 PM
  • Each building should have their own subnet and if the DC is in the same subnet of the clients, the DHCP scope should have the same ip range than the DC.

    If you create a separate network for your clients, you will need to manage multiple vlan and routing but it's may be the way your network is designed.


    This posting is provided AS IS without warranty of any kind

    • Marked as answer by CFSD6 Friday, October 28, 2016 3:27 PM
    Thursday, October 27, 2016 10:58 PM

All replies

  • You want to create 2 DHCP Scopes using the same Subnet

    10.2.x.x and 10.2.x.x with a 255.255.0.0 as subnet.  You will not be able to do that.  There is an overlap.

    You will have to change one of the subnet for another.  If you need to keep a /16 subnet, then change the subnet of the Wired or Wireless for let say 10.3.0.x and keep the other for 10.2.x.x.


    This posting is provided AS IS without warranty of any kind

    • Marked as answer by CFSD6 Friday, October 28, 2016 3:26 PM
    Thursday, October 27, 2016 7:13 PM
  • Thank you for the prompt reply.

    Here is another issue - Each building has it's own DC EX: 10.2.0.1, 10.3.0.1, etc...

    So will need to create a new for each DC EX: 10.10.xx.xxx  ?

    Thursday, October 27, 2016 8:23 PM
  • New DHCP scope you mean?

    if there is DHCP clients, yes


    This posting is provided AS IS without warranty of any kind

    • Marked as answer by CFSD6 Friday, October 28, 2016 3:26 PM
    Thursday, October 27, 2016 8:46 PM
  • Yes I meant each DC has its own Scope as above.

    So is it possible to create a new scope on each DC with 10.10.77.xx or would that cause a lot of issues?

    The GW for the existing scopes are 10.2.0.1, 2, 3, etc...

    Does that matter?

    Thank you.

    Thursday, October 27, 2016 10:14 PM
  • well...

    if you have 10 sites where each site gas it own subnet

    ex: 10.2.3.0 /24 ; 10.2.4.0 /24 and so on, yes you need a DHCP scope per subnet.

    For the gateway, each scope will have it's own gateway and you should get this information from your network team


    This posting is provided AS IS without warranty of any kind

    • Marked as answer by CFSD6 Friday, October 28, 2016 3:27 PM
    Thursday, October 27, 2016 10:36 PM
  • Each DC can be a DHCP server if you want or you can have only 1 or 2 DHCP server for your entire environment.

    This posting is provided AS IS without warranty of any kind

    Thursday, October 27, 2016 10:39 PM
  • Thank you again - you are giving me great information.

    Okay here is what they got - a DC in each building running its own DHCP and networked throughout the LAN to each other with each having its own scheme such a:

    Building 1 = 10.2.0.1/24

    Building 2 = 10.3.0.1/24

    Building 3 = 10.4.0.1/24

    Building 4 = 10.5.0.1/24

    So I understand, I will need to create a separate scope for each building like - 10.20.xxx.xxx for Building 1 and so forth?

    • Marked as answer by CFSD6 Friday, October 28, 2016 3:27 PM
    Thursday, October 27, 2016 10:52 PM
  • Each building should have their own subnet and if the DC is in the same subnet of the clients, the DHCP scope should have the same ip range than the DC.

    If you create a separate network for your clients, you will need to manage multiple vlan and routing but it's may be the way your network is designed.


    This posting is provided AS IS without warranty of any kind

    • Marked as answer by CFSD6 Friday, October 28, 2016 3:27 PM
    Thursday, October 27, 2016 10:58 PM
  • Thank you Sir.

    All your information is greatly appreciated - I will follow your recommendations.

    Friday, October 28, 2016 3:27 PM