Vpn Site Coupling - Lancom 1751 UMTS Manual

110584_LC-1751-UMTS-MANUAL-EN.book Page 59 Tuesday, February 26, 2008 5:16 PM

8.2

VPN site coupling

As well as connecting single workstations to the headquarters, the UMTS/
HSxPA interface can be used for full-blown network coupling.
To couple two networks via a UMTS interface, the initial step is to set up net-
work coupling between the two VPN routers, for example by using the Wizard
in LANconfig.
The following aspects must be considered for the configuration of network
coupling via UMTS/HSxPA:

As soon as the Internet connection has been established, the section for
WAN connections in LANmonitor shows the network being used for the
connection.
The status of the UMTS connection is also displayed by flashing codes
from the UMTS LEDs on the front of the device.
When dialing-in, some mobile telephone providers assign the UMTS card
with an IP address from their own internal range of addresses. This repre-
sents no problem for a normal Internet connection. However, this can lead
to problems when establishing a VPN connection as the IP addresses of
the VPN devices may be required for the negotiation of the encryption
parameters. With NAT-Traversal activated in the headquarter VPN gate-
way, it is possible to establish VPN connections from branch offices that
use private IP addresses.
For further information on this subject refer to the LCOS reference
manual.
When coupling networks with the Wizard, the secure "main mode" is ini-
tially used for the exchange of IKE keys. Main Mode negotiation takes the
IP addresses of the VPN terminals into account, which can lead to pro-
LANCOM 1751 UMTS
Chapter 8: Setting up the UMTS profile
59