LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN
Chapter 5: Linking two networks
5 Linking two networks
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Only LANCOM
1621 ADSL/ISDN and LANCOM 1711 VPN
With the network interconnection (also known as LAN to LAN coupling) of the LANCOM, two local networks are linked. The LAN to LAN coupling can be realized in principle in two different ways:
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.
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.
The following instructions will assume that LANCOM 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 information in this regard.
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 therefore offers a whole range of security mechanisms that can pro- vide an outstanding level of protection:
VPN: Network couplings via VPN transmit data by IPSec. The data are encrypted by AES,
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