Setting up IP addressing

When you define a mobile network interface (MNI) and choose for IP traffic to be routed statically rather than using a dynamic host configuration protocol (DHCP) server, you set up a subnetwork.

A subnetwork is an extension to the basic IP addressing scheme and consists of a contiguous range of IP addresses where a portion of the host address is interpreted as the local network address.

The mask is a 32-bit mask that is used to identify the subnetwork address bits in the host portion of an IP address. Every bit that is not 0 is an exact match.

To define a subnetwork, supply the host IP address for the network and the subnet mask that extends the network. For example, if a host IP address of is extended by 255 IP addresses, the mask for that IP address is

To set up dynamic shared IP addressing, define a Dynamic Host Configuration Protocol (DHCP) group. Right-click the organizational unit (OU) in which you want the group added. From the menu, click Add Resource > Group > DHCP group.

When a user is defined to a DHCP group, an available IP address from the shared pool is assigned to that user at login time.

A DHCP group contains pools of IP addresses, which are specified as one or more ranges of addresses and single addresses and also specified as one or more ranges of addresses and single addresses that are to be excluded from the group.

The ranges can be:
  • From lowest IP address to highest IP address
  • An IP address and a mask
  • A number of addresses starting with a given IP address for a given number of addresses