ELSA LANCOM Business LC-4X00, Руководство пользователя

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Workshop
ELSA LANCOM Business
104
You will find the following symbols elsewhere in the step-by-step instructions:
Which device are you using?
You can work through the tasks in Workshop described using a number of models from
the
ELSA LANCOM family. Any restrictions with regard to specific models are indicated
by the corresponding symbols shown next to the text.
All descriptions apply to routers with a single S
0
interface, i.e. with 2 B channels. For
units with several S
0
interfaces (such as
ELSA LANCOM Business 4100), the settings may
need to be transferred to the other interfaces and channels.
Additional information
This symbol tells you if a setting is optional and is not an essential requirement for the
simple functioning of the example configuration. This category includes, for example,
filter settings which prevent specific data packets being transferred or security measures
which restrict access to the device.
Internet applications
This first section on the practical uses of the devices will introduce you to applications
involving the Internet.
The first example shows a company seeking to use a router on its network to connect up
to the Internet. This will give all workstation computers on the LAN access to the
services and possibilities offered by the Internet through a single account with a service
provider. At the same time the router used in this way will also act as a firewall to
protect the local area network against access from outside and to make the workstation
computers inaccessible from the Internet.
The second example depicts a company who not only wishes to make use of the services
offered on the Internet as a passive subscriber, but also wishes to be an active provider
of its own information. This is done by installing a web server on the company's local
area network connected to the provider by a leased-line connection. While this server
must obviously be accessible from the Internet, all other computers on the network must
remain protected behind the firewall.
Menu Indicates a submenu
Value Indicates a value which can be modified
Table Indicates a table whose entries can be modified.