CTC Union ATU-R140, User Manual

Page: 21 / 46

ATU-R140 ADSL Ethernet USB Router User’s Guide
21
4.5 Configuring the LAN
By default, your gateway has DHCP server (LAN side) enabled. If you already have a DHCP
server running on your network, you
must disable one of the two DHCP servers; if you plug a
second DHCP server into the network, you will experience network errors and the network will
not function normally. Click setup. Under LAN Setup, select LAN Configuration. This will bring
up the screen shown in Figure 10.
Figure 10 (LAN configuration)
4.5.1 Enable/Disable DHCP
To enable or disable DHCP go to the Home screen. Click setup and under LAN Setup, select
LAN Configuration, press Configure. This will bring up the screen shown in Figure 12.
The Start IP Address is where the DHCP server starts issuing IP addresses. This value must
be greater than the gateways IP address value. For example if the gateways IP address is
192.168.1.1 (default) than the starting IP address must be 192.168.1. 2 (or higher).
The End IP Address is where the DHCP server stops issuing IP addresses. The ending
address cannot exceed a subnet limit of 254. Hence the max value for our default gateway is
192.168.1.254. If the DHCP server runs out of DHCP addresses, users will not get access to
network resources. If this happens you can increase the Ending IP address (to the limit of
255) or reduce the lease time.
The Lease Time is the amount of time a network user will be allowed connection to the
Gateway with their current dynamic IP address. The amount of time is in units of seconds; the
default value is 3600 seconds (1 hour).
Note: If you change the start or end values, make sure the values are still within the same
subnet as the gateways IP address. In other words, if the gateways IP address is 192.168.1.1
(default) and you change the DHCP start/end IP addresses to be 192.128.1.2/192.128.1.100,
you will not be able to communicate to the gateway if your PC has DHCP enabled.