NEC UNIVERGE SV9100 Manual page 37

Class A
Class B
Class C
A Public address is normally only used when a device is directly connected to the internet. This is unlikely
in the case of the equipment. If public addressing is used, the numbers are normally allocated by an ISP.
Subnet Mask
As the IP address includes information to identify both the network and the final destination, the Subnet
Mask sets apart the network and destination information. The default subnet masks are:
Class A
Class B
Class C
The Subnet Mask is made up of four groups of numbers. When a group contains the number 255, the
router ignores or masks that group of numbers in the IP address as it is defining the network location of
the final destination.
For example, if the IP address is: 172.16.0.10 and the Subnet Mask used is Class B (255.255.0.0), the first
two groups of numbers (172.16) are ignored once they reach the proper network location. The next two
groups (0.10) are the final destination within the LAN to which the connection is to be made.
For sub-netted networks, the subnet mask may be different from the default subnet masks listed
above.
DHCP
Dynamic Host Configuration Protocol (DHCP) assigns a dynamic IP address. Network control may be
easier with DHCP as there is no need to assign and program individual IP addresses for the LAN
equipment. To use a dynamic IP address, a DHCP server must be provided. The UNIVERGE SV9100
system GCD-CP10 blade provides an internal DCHP server, enabling the ability to use DHCP.
When equipment, which is connected to the LAN (the DHCP client), is requesting an IP address, it
searches the DHCP server. When the request for an address is recognized, the DHCP server assigns an
IP address, Subnet mask, and the IP address of the router, based on UNIVERGE SV9100 system
programming.
Note that the GCD-CP10 blade must always have a static IP address. This address is set in Program 10-
12-01 : GCD-CP10 Network Setup – IP Address (default: 192.168.0.10).
Configuration Examples
Example Configuration 1 - Existing Network with Static Addressing
Each client device has a manually assigned IP address in the 192.168.1.0/24 network (i.e., 192.168.1.1 to
192.168.1.254 with a subnet mask of 255.255.255.0). They also have a default gateway address
configured (192.168.1.254) this allows the device to route packets to destinations that exist outside of their
own LAN.
Exa m p le C o n fig u ra tio n 1 - Existin g N e two rk with Sta tic IP Ad d re sse s
10.0.0.0 ~ 10.22.255.255
172.16.0.0. ~ 172.31.255.255
192.168.0.0 ~ 192.168.255.255
255.0.0.0
255.255.0.0
255.255.255.0
Part 2: VoIP Manual 37