3Com SUPERSTACK 3CR16110-95, User Manual, Page: 57 / 214

Changing the Basic Network Settings 57
When using IP addresses on a LAN which have not been assigned by an
Internet Service Provider, it is a good idea to use addresses from a special
address range allocated for this purpose. The following IP address ranges
can be used for private IP networks and do not get routed on the
Internet:
10.0.0.0 - 10.255.255.255
172.16.0.0 - 172.31.255.255
192.168.0.0 - 192.168.255.255
Select NAT Enabled from the Network Addressing Mode drop-down list if
the network uses private IP addresses or if addresses are in short supply.
NAT with DHCP Client
Choose NAT with DHCP Client if you obtain the Firewall WAN IP address
from a remote DHCP server.
NAT with PPPoE Client
Choose NAT with PPPoE Client if your Internet connection for the Firewall
WAN IP Address is to be obtained from a remote PPPoE server.
Specifying the LAN
Settings
For the LAN settings, specify:
Firewall LAN IP Address.
This is the IP address that is given to the Internet Firewall and used to
access it for configuration and monitoring. Choose a unique IP address
from the LAN address range.
LAN Subnet Mask
This value is used to determine what subnet an IP address belongs to. An
IP address has two components, the network address and the host
address.
For example, consider the IP address
192.168.228.17 .
Assuming a
Class C subnet mask of
255.255.255.0
is used, the first three numbers
(
192.168.228.
) represent the Class C network address, and the last
number (
17
) identifies a particular host on this network.
The following setting will also be available if PPPoE is selected:
DUA1611-0AAA02.book Page 57 Thursday, August 2, 2001 4:01 PM