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Multiple IP Scope, signle Subnet

    Pregunta

  • Hi,

    After a little advise on whether the following is possible.

    We have 1 single IP subnet, for example 10.10.0.0/20

    We want to put Infrastructure (static's) on 10.10.1.0/20

    Servers on 10.10.2.0/20 (DHCP with reservations)

    Clients on 10.10.3.0/20 (DHCP) (only 10.10.3.1 - 10.10.4.254) (Split Scope 1)

    Clients on 10.10.5.0/20 (DHCP) (only 10.10.5.1 - 10.10.6.254) (Split Scope 1)

    Others 10.10.7......>>> others

    Can this be done? I know you can use classID for different options, i.e. different router addresses, but can use target different scopes in a single subnet?

    Any help or documentation would be much appreciated

    Nigel

    domingo, 13 de febrero de 2011 12:33

Respuestas

  • Hi Nigel,

    Just to get this out of the way, if I understand you correctly, that's a pretty large subnet. I assume you have the infrastructure to handle the traffic for upto 4094 hosts on this size of a subnet. The 10.10.0.0/20 subnet breaks down like this:

    /20  =  11111111.11111111.11110000.00000000
    Mask =  255.255.240.0
    Range:  10.10.0.1 to 10.10.15.254

    If you're leaving them all on this one subnet, yes, you can break down and create multiple ranges, but you will need classIDs to control which hosts get which range. It's kind of a tedious task. My suggestion is to make the subnets smaller, and assuming you are using switches that support VLANs, I would suggest to take advantage of that, and use IP Helpers or DHCP Relay Agents for each subnet. I would think it's a lot easier to configure, maintain, administer, etc, without having to alter each new host that comes on to make sure it gets the correct classID.

    Ace

     

     


    Ace Fekay
    MVP, MCT, MCITP EA, MCTS Windows 2008 & Exchange 2007, MCSE & MCSA 2003/2000, MCSA Messaging 2003
    Microsoft Certified Trainer
    Microsoft MVP - Directory Services

    This posting is provided AS-IS with no warranties or guarantees and confers no rights.

    • Marcado como respuesta Tiger Li miércoles, 23 de febrero de 2011 11:27
    lunes, 14 de febrero de 2011 1:55
  • Hi Nigel,

     

    Thanks for posting here.

     

    I agree with Ace that you should reduce the address space for each scope by modifying mask ,connect each subnet with router/3th layout device and configure DHCP rely for supporting additional subnets:

     

    Planning DHCP networks

    http://technet.microsoft.com/en-us/library/cc786002(WS.10).aspx

     

    DHCP Best Practices

    http://technet.microsoft.com/en-us/library/cc780311(WS.10).aspx

     

    Thanks,

     

    Tiger Li


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
    • Marcado como respuesta Tiger Li miércoles, 23 de febrero de 2011 11:27
    lunes, 14 de febrero de 2011 7:04

Todas las respuestas

  • Hi Nigel,

    Just to get this out of the way, if I understand you correctly, that's a pretty large subnet. I assume you have the infrastructure to handle the traffic for upto 4094 hosts on this size of a subnet. The 10.10.0.0/20 subnet breaks down like this:

    /20  =  11111111.11111111.11110000.00000000
    Mask =  255.255.240.0
    Range:  10.10.0.1 to 10.10.15.254

    If you're leaving them all on this one subnet, yes, you can break down and create multiple ranges, but you will need classIDs to control which hosts get which range. It's kind of a tedious task. My suggestion is to make the subnets smaller, and assuming you are using switches that support VLANs, I would suggest to take advantage of that, and use IP Helpers or DHCP Relay Agents for each subnet. I would think it's a lot easier to configure, maintain, administer, etc, without having to alter each new host that comes on to make sure it gets the correct classID.

    Ace

     

     


    Ace Fekay
    MVP, MCT, MCITP EA, MCTS Windows 2008 & Exchange 2007, MCSE & MCSA 2003/2000, MCSA Messaging 2003
    Microsoft Certified Trainer
    Microsoft MVP - Directory Services

    This posting is provided AS-IS with no warranties or guarantees and confers no rights.

    • Marcado como respuesta Tiger Li miércoles, 23 de febrero de 2011 11:27
    lunes, 14 de febrero de 2011 1:55
  • Hi Nigel,

     

    Thanks for posting here.

     

    I agree with Ace that you should reduce the address space for each scope by modifying mask ,connect each subnet with router/3th layout device and configure DHCP rely for supporting additional subnets:

     

    Planning DHCP networks

    http://technet.microsoft.com/en-us/library/cc786002(WS.10).aspx

     

    DHCP Best Practices

    http://technet.microsoft.com/en-us/library/cc780311(WS.10).aspx

     

    Thanks,

     

    Tiger Li


    Please remember to click “Mark as Answer” on the post that helps you, and to click “Unmark as Answer” if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.
    • Marcado como respuesta Tiger Li miércoles, 23 de febrero de 2011 11:27
    lunes, 14 de febrero de 2011 7:04