3com 3CRWE52196 ユーザーガイド

ページ / 120
How does a Device Obtain an IP Address and Subnet Mask?
87
This type of IP Address operates on a subnet mask of ‘255.255.0.0’.
See 
 for an example about how a network (only four computers 
represented) and a Gateway might be configured.
Table 4   IP Addressing and Subnet Masking
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 Gateway 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.
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 unable to contact a DHCP server. 
Automatic IP addressing is a scheme where devices allocate themselves 
Device
IP Address
Subnet Mask
PC 1
192.168.100.8
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
Gateway
192.168.002.72
255.255.0.0