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14 Introduction
The Internet consists of countless large and small networks that are interconnected
into the world's largest WAN via routers. The router links all the workstation computers
on your local area network to the global Internet. Security functions such as IP mas-
querading protect your LAN against unauthorized access from outside.
LAN to LAN coupling (via VPN or ISDN)
LAN to LAN coupling links individual LANs to form one large network, even if this
means crossing continents. A typical example: A branch office is to be connected to
the LAN of the headquarters. In principle, you can connect LANs in two ways:
High-speed coupling via VPN
The fastest and most economical LAN to LAN links are possible with VPN (Virtual
Private Network) technology, as VPN uses the Internet as the basis for its commu-
nications. The fast xDSL connection of the router comes into its own here. The pre-
condition: a VPN gateway with access to the Internet is required on either side of
the network interconnection.
Conventional via ISDN
Without VPN, a LAN to LAN interconnection can alternatively be realized via
ISDN. In this case, an intelligent line management and sophisticated filter mecha-
nisms keeps connection costs low.
Remote access to the company network (via VPN or ISDN)
The work of many office workers in modern organizations is less and less dependent
on any definite location—the most important factor here is unimpaired access to
shared and freely available information.
Remote Access Service (RAS) is the magic word here. Employees working from home
or field staff can dial into the company network via VPN or ISDN. When working with
remote access via ISDN, the router protects the company network: the call back func-
tion only grants access to known and registered users.
The LANCOM VoIP Basic Option
The term Voice over IP (VoIP) refers to voice communications over computer networks
based on the Internet protocol (IP). The core idea is to provide the functions of traditional
telephony via cost-effective and wide-spread networking structures such as the Internet.
VoIP itself is not a standard, rather it is a collective term for the various technologies
(equipment, protocols, voice encoding, etc.) which make voice communications in IP net-
works possible.
VPN gateways
VPN tunnel via the
Internet
14


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