Configuration and Management
The following information and configuration options are displayed on top of the LAN page:
W20 IP address The LAN address of the Ericsson W20.
Subnet mask The subnet mask, which determines the range of IP addresses on the subnet.
If you want to change the W20 IP address, make sure that the new address is not included in the DHCP server IP address range, displayed in the DHCP Server section. The default range is 192.168.1.2 – 192.168.1.100.
Before you change the W20 IP address or subnet mask you also have to make sure that the DHCP server IP address range is included in the new subnet. If you want to change the subnet not to include the DHCP IP address range, you first have to disable the DHCP server.
To change the W20 IP address or subnet mask, type the new value in the corresponding field and click Apply 
to save the settings.
Note: If you change the LAN IP address while connected to the Ericsson W20 web pages through a web browser, you will be disconnected. You have to redirect the web browser to the new address in order to confirm the new settings. Type the new LAN IP address in the Address (URL) field and press the key.
2.5.1DHCP Server
The Ericsson W20 incorporates a DHCP (Dynamic Host Configuration Protocol) server that assigns dynamic IP addresses to local clients. The IP addresses are collected from a predefined range of available addresses. The default address range is suitable for most local networks.
The DHCP server uses the concept of a "lease”, that is the amount of time that a given IP address will be valid for a specific device. If the lease time expires and the device is still connected, the lease is automatically renewed.
The following configuration options are displayed in the DHCP server section on the LAN page:
Enable DHCP server | If this check box is selected the DHCP server is |
| working, otherwise it is turned off. |
IP address range | The first IP address in a range of IP addresses |
from | that can be assigned to the LAN clients. |
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