OpenVPN DHCP



  • Hello,

    I have an question about OpenVPN server on pfSense 2.1.5.

    Is it possible to assign connected clients an IP from one big DHCP scope instead of for example 192.168.3.6 and the next one 192.168.3.10 (<-not sure if that is the right IP!)
    I want everyone connected to the VPN to get an normal IP range, so user 1 gets 192.168.3.2 and user 2 gets 192.168.3.2, and so on.

    Is this possible, and how can this be realized if it's possible?


  • Rebel Alliance Global Moderator

    @Chrisiesmit93:

    so user 1 gets 192.168.3.2 and user 2 gets 192.168.3.2, and so on.

    Well that would not be good if you gave the users the same IP.
    In your openvpn setup check the

    Allocate only one IP per client (topology subnet), rather than an isolated subnet per client (topology net30).
      Relevant when supplying a virtual adapter IP address to clients when using tun mode on IPv4.
    Some clients may require this even for IPv6, such as OpenVPN Connect (iOS/Android). Others may break if it is present, such as older versions of OpenVPN or clients such as Yealink phones.

    By default clients get IP in a /30 of the subnet you assigned to clients.  In my case 10.0.8.0/24, so they get /30 of that

    example
    Ethernet adapter vpn:

    Connection-specific DNS Suffix  . : local.lan
      Description . . . . . . . . . . . : TAP-Windows Adapter V9
      Physical Address. . . . . . . . . : 00-FF-5A-2F-7E-EA
      DHCP Enabled. . . . . . . . . . . : Yes
      Autoconfiguration Enabled . . . . : Yes
      IPv4 Address. . . . . . . . . . . : 10.0.8.6(Preferred)
      Subnet Mask . . . . . . . . . . . : 255.255.255.252
      Lease Obtained. . . . . . . . . . : Friday, February 20, 2015 7:45:05 AM
      Lease Expires . . . . . . . . . . : Saturday, February 20, 2016 7:45:05 AM
      Default Gateway . . . . . . . . . :
      DHCP Server . . . . . . . . . . . : 10.0.8.5
      DNS Servers . . . . . . . . . . . : 192.168.1.253
      NetBIOS over Tcpip. . . . . . . . : Enabled