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WS 2000 Wireless Switch System Reference Guide9-40
Configuring the Engineering LAN
Leo selects Subnet1 from the choices under the LAN heading. He enters a new name for the subnet, Eng-SN, to make it
easier to recognize this subnet throughout the WS 2000 interface.
He also selects the option This interface is a DHCP Server. Choosing this DHCP option means that the switch will pick
IP addresses from the Address Assignment Range and assign them to network clients on this subnet, as needed.
This screen also sets the IP address for the switch’s interface to the subnet. Any address that starts with “192.168” is an
internal-use-only IP address. That is, network administrators are free to use these IP addresses anyway they want, as long
as the IP addresses are never visible to the outside world. The switch defaults to an address of 192.168.0.1 for the first
subnet interface. Leo elects to use the range of IP addresses from 192.168.0.11 to 192.168.0.254 for the DHCP clients in this
subnet.
Leo then selects the Advanced DHCP Server button. The DNS server IP addresses and the Gateway IP address entered
here will be passed down the DHCP clients for this subnet for their own use while associated with this subnet. Leo enters
the IP addresses that the corporation’s IT department has specified for the corporate primary and secondary DNS servers.
For the gateway, Leo enters the IP address for the subnet, the same IP address that he entered for the IP Address in the IP
Parameters section of the Subnet screen.
The DHCP Lease Time (sec) specifies how long in seconds a client may keep an IP address when that client is not active on
the net. The lease time is currently set for 86,400 seconds, or 24 hours. Leo expects that people using these WLANs will
connect for a work day or not. While in the office, he expects that their machines will initiate contact with the network every
10 or 15 minutes for email. When they unplug to go home, this lease time will hold their IP address for another full day and
not return it to the usable pool until the end of the next day. Leo would prefer that the lease time expire sometime during
the night. He figures a lease time of somewhere between 10,000 seconds and 30,000 seconds is appropriate for this
application. Leo sets it to 10000 seconds and figures he will change it if anyone complains.