3com 3CRWDR200B-75 ユーザーズマニュアル

See Table 4 for an example about how a network (only four computers 
represented) and a Router might be configured.

Table 4   IP Addressing and Subnet Masking

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)

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 disconnect from the network.

DHCP will work on any client Operating System such as Windows

®

 95, 

Windows 98 or Windows NT 4.0. 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 numbers of 
users on them.

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.

Network devices use automatic IP addressing if they are configured to 
acquire an address using DHCP but are unable 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 

PC 1

192.168.1.8

255.255.0.0

PC 2

192.168.201.30

255.255.0.0

PC 3

192.168.113.155

255.255.0.0

PC 4

192.168.002.230

255.255.0.0

Router

192.168.002.72

255.255.0.0