Linking Two Networks - Lancom DSL Series Manual

5 Linking two networks

With the network interconnection (also known as LAN to LAN coupling) of the
LANCOM Wireless DSL, two local networks are linked. The LAN to LAN cou-
pling can be realized in principle in two different ways:
Only LANCOM
1811 Wireless DSL
and LANCOM 1821
Wireless ADSL
Always configure both sides
Both routers involved in the network interconnection must be configured.
Care must be taken to ensure that the configuration information provided
matches.
A setup wizard handles the configuration of the connection in the usual con-
venient manner.
Security aspects
You must, of course, protect your LAN against unauthorized access. A
LANCOM Wireless DSL therefore offers a whole range of security mechanisms
that can provide an outstanding level of protection:
VPN: For coupling via VPN, the connection between both LANs is estab-
lished over a specially secured connection through the public Internet. A
router with VPN support is required in both LANs.
ISDN: For coupling via ISDN, a direct connection between both LANs is
established over an ISDN connection. A router with ISDN interface is
required in both LANs.
The following instructions will assume that LANCOM Wireless DSL
routers are being used on both sides. A network interconnection may
also be realized with routers from other manufacturers. A mixed setup
usually requires more extensive configuration measures for both
devices, however. Please refer to the reference manual for more infor-
mation in this regard.
VPN: Network couplings via VPN transmit data by IPSec. The data are
encrypted by AES, 3-DES, Blowfish or CAST encryption algorithms.
ISDN: For network couplings via ISDN, the connection password, the
checking of the ISDN number and the callback function ensure the secu-
rity of the connection.
LANCOM Wireless DSL – LANCOM Wireless ADSL
Chapter 5: Linking two networks
49