3Com OfficeConnect 3CR856-95, User Manual

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network’s subnet. The default IP Address of the Gateway is
192.168.1.1.
When you change the IP Address of the Gateway you must
reboot all computers that gain their IP address from the Gateway
before they will be able to access the Internet.
If you are using static addresses for your PCs you must alter the
network configuration on each PC so that they have an IP
address within the same subnet as the Gateway and have their
default Gateway set as the Gateway’s IP address.
If you reconfigure your network you may need to change your
Subnet Mask . The Subnet Mask detemines how many addresses
are available to your network. The default Subnet Mask is
255.255.255.0.
For example if the IP Address of your Gateway is 192.168.1.1
and the Subnet Mask of your network is 255.255.255.0 then
your network can have a maximum of 254 addresses from
192.168.1.1 to 192.168.1.254 (192.168.1.0 and 192.168.1.255
are reserved by the subnet and are not available for use).
When you change the IP Address or Subnet Mask of the
Gateway you should review the DHCP Server settings as
described below.
Changing the DHCP Server Settings
This section allows to you enable, disable and configure the
settings of the Gateway’s DHCP server.
If you intend to use the Gateway to control the permissions of
individual machines on your network then you must use the
Gateway’s DHCP server to allocate addresses (or use static
addressing). If you use another DHCP server you may get
unexpected results. See
“PC Privileges” on page 45 .
To enable the DHCP Server ensure that the Enable check box is
ticked. To disable the DHCP Server ensure that the Enable check
box is cleared.
Set the IP Pool Start Address and IP Pool End Address to the first
and last address you want the Gateway to allocate to computers.
The IP address pool must be contained within the subnet as
defined in
“Changing the LAN settings” on page 35 . The default
start and end addresses are 192.168.1.100 and 192.168.1.200.
If you have a WINS Server on your network enter its IP address in
the
WINS Server box. The gateway will pass this information on
to all Windows PCs that obtain an address from its DHCP server.
If you will be using One-to-One NAT you must set up a range
that is one less than the number of public addresses allocated to
you by your ISP. The DHCP range must also be identical to the
range specified when you set up One-to-One NAT. See
“Setting
up One-to-One NAT” on page 42 .
DHCP Clients List
The DHCP Clients screen provides details of the devices that have
been given IP addresses by the Gateway’s DHCP server. For each
device that has been granted a lease, the
IP address , Host Name
and MAC address of that device is displayed.
dua08569-5aaa01.book Page 36 Wednesday, March 13, 2002 10:39 AM