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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN
̈ Chapter 1: Introduction
18
EN
access to the Internet is required on either side of the network inter-
connection.
୴ Conventional via ISDN
Without VPN, a LAN to LAN interconnection can alternatively be real-
ized via ISDN. In this case, an intelligent line management and
sophisticated filter mechanisms 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 function only grants access to known and
registered users.
1.5 What can your LANCOM do?
The following table contains a direct comparison of the properties and func-
tions of your devices with other models:
VPN gateways
VPN tunnel via the
Internet
LANCOM 821
ADSL
LANCOM 1621
ADSL
LANCOM 1711
DSL
Applications
Internet access
LAN to LAN coupling via VPN