90 Home Station ADSL ADB P.DG A4001N
Type Two
In larger networks, where there are more devices, the IP address of ‘192.168.1.8’ is, again, split into two parts but is
structured differently:
• Part one (‘192.168’) identifies the network on which the device resides.
• Part two (‘.1.8’) identifies the device within the network.
This type of IP Address operates on a subnet mask of ‘255.255.0.0’.
How does a Device Obtain an IP Address and Subnet Mask?
There are three different ways to obtain an IP address and the subnet mask. These are:
• Dynamic Host Configuration Protocol (DHCP) Addressing
• Static Addressing
• Automatic Addressing (Auto-IP Addressing)
DHCP Addressing
The Router contains a DHCP server, which allows computers on your network to obtain an IP address and subnet
mask automatically. DHCP assigns a temporary IP address and subnet mask which gets reallocated once you dis-
connect from the network.
DHCP will work on any client Operating System. Also, using DHCP means that the same IP address and subnet
mask will never be duplicated for devices on the network. DHCP is particularly useful for networks with large num-
bers of users on them.
Static Addressing
You must enter an IP Address and the subnet mask manually on every device. Using a static IP and subnet mask
means the address is permanently fixed.
Auto-IP Addressing
Network devices use automatic IP addressing if they are configured to acquire an address using DHCP but are una-
ble to contact a DHCP server. Automatic IP addressing is a scheme where devices allocate themselves an IP address
at random from the industry standard subnet of 169.254.x.x (with a subnet mask of 255.255.0.0). If two devices
allocate themselves the same address, the conflict is detected and one of the devices allocates itself a new ad-
dress. Automatic IP addressing support was introduced by Microsoft in the Windows 98 operating system and is
also supported in Windows 2000, Windows XP, Windows Vista and Windows 7.
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