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VincenzoV's avatar
VincenzoV
Aspirant
Jul 13, 2019

DHCP for /16 netmask (Legacy class B network)

Hi all

I need a /16 (class B) network in my LAN (172.16.x.z/16). DHCP work fine, but I can't set byte 3 in DNS: it's grayed!

I need DHCP range from 172.16.1.0 to 172.16.255.254


Orbi RB50, firmware V2.3.1.60


Thanks

5 Replies

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  • CrimpOn's avatar
    CrimpOn
    Guru
    Jul 13, 2019

     Most residential routers are designed to create at most 254 private IP addresses.  It is certainly creative to pick part of the 172 address space (most users appear to accept whatever Orbi suggests, usually 192.168 or 10.0).

     

    I think this is not going to happen for you.

  • FURRYe38's avatar
    FURRYe38
    Guru
    Jul 13, 2019

    "I need DHCP range from 172.16.1.0 to 172.16.255.254" This is not a valid networking range for home class routers. Or any networking router. 

    172.16.1.1 thru .1.254 is valid or 172.16.255.1 thru .254 is valid. 

     

    VincenzoV wrote:

    Hi all

    I need a /16 (class B) network in my LAN (172.16.x.z/16). DHCP work fine, but I can't set byte 3 in DNS: it's grayed!

    I need DHCP range from 172.16.1.0 to 172.16.255.254


    Orbi RB50, firmware V2.3.1.60


    Thanks

     

    • VincenzoV's avatar
      VincenzoV
      Aspirant
      Jul 14, 2019

       

      FURRYe38 wrote:

      This is not a valid networking range for home class routers. Or any networking router. 

      I need a /16 network (legacy class B), not a /24 (legacy class C)

      - 172.16.0.0/16 is the network address

      - 172.16.0.1/16 is the first valid address (tre Orbi gateway)

      - up to 172.16.0.255/16 will be, in my network, static IPs

      - from 172.16.1.0/16 to 172.16.255.254/16 will be under DHCP server control. This is my problem with Orbi: I can't set it!

      - 172.16.255.255/16 is the broadcast address

       

      • FURRYe38's avatar
        FURRYe38
        Guru
        Jul 14, 2019

        This is probaby not supported by Orbi. It's DHCP services are simple for home class networks. 

        Sounds like you need a business calss router. 

  • CaptainZack's avatar
    CaptainZack
    Initiate
    Jul 14, 2019

    Really?  You need 65k addesses?  Do you have a clue what the ramifications are of using that large a subnet?  Do you even know what a broadcast domain is?  If you truly have a need for more than 200+ host addresses, then Orbi (or any other consumer-grade router/Wi-Fi system) is not the right class of network gear for you.