Operation Manual

Operating modes and functions

ELSA LANCOM Wireless

English

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The DNS server in the

ELSA LANCOM Wireless

can also be used as an extremely

convenient filter mechanism. Requests for domains can be prohibited throughout

the LAN, for subnetworks, or even for individual computers – simply by specifying

the domain name.

When processing requests for specific names, the DNS server takes advantage of all of

the information available to it:

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First, the DNS server checks whether access to the name is not prohibited by the

filter list. If that is the case, an error message is returned to the requesting

computer stating that access to the address has been denied.

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Next, it searches in its own static DNS table for suitable entries.

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If the address cannot be found in the DNS table, it searches the dynamic DHCP

table. The use of DHCP information can be disabled if required.

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If no information on the name can be located in the previous tables, the DNS server

then searches the lists of the NetBIOS module. The use of the NetBIOS information

can also be disabled if necessary.

If the requested name cannot be found in any of the information sources available to it,

the DNS server sends the request to another server – that of the Internet provider, for

example – using the normal DNS forwarding mechanism, or returns an error message to

the requesting computer.

Setting up the DNS server

The settings for the DNS server can be found in the configuration tool

ELSA LANconfig

in the 'TCP/IP' configuration section on the 'DNS Server' tab. To set up the DNS server,

proceed as follows:

햲

Switch the DNS server on.

set setup/dns-module/operating on

햳

Enter the domain in which the DNS server is located. The DNS server uses this

domain to determine whether the requested name is located in the LAN. Entering

the domain is optional.

set setup/dns-module/domain yourdomain.com

햴

Specify whether information from the DHCP server and the NetBIOS module should

be used.

set setup/dns-module/dhcp-usage yes

set setup/dns-module/NetBIOS-usage YES