LANCOM 821+ – LANCOM 1711+ VPN – LANCOM 1721 VPN
Chapter 6: Providing dial- in access
51
EN
Please refer to chapter “Linking two networks” on page 39 for advice
about the other values required for the installation of a RAS access.
6.1.2
Settings for TCP/IP
Each active RAS user must be assigned an IP address when using the TCP/IP
protocol.
This IP address can be permanently assigned when setting up a user. However,
it is simpler to let the LANCOM Router automatically assign free IP addresses
to users when they dial in. In this case you only need to specify the IP address
range that the LANCOM Router should use for RAS users.
During both manual and automatic IP address assignment, please ensure that
only free addresses from the address range of your local network are used. In
our example, the IP address '10.0.1.101' will be assigned to the PC when con-
necting.
This IP address makes the computer a fully-fledged member of the LAN: with
the appropriate rights, it can access all of the other devices in the LAN. The
The ISDN calling line identity (CLI)
The ISDN caller ID
—
also known as CLI (
C
alling
L
ine
I
dentity)
—
this is the telephone number of
the caller which is transmitted to the participant receiving the call. As a rule, it consists of the
country and area codes and an MSN.
The CLI is well-suited for authentication purposes for two reasons: it is very difficult to manip-
ulate, and the number is transferred free of charge via the ISDN control channel (D-channel).
10.0.
1
.100
(0123) 123456
User: 'SAMPLE'
(0123) 777888
ISDN adapter
Remote
workstation
IP:
10.0.
1.101
LAN of the head office.
IP: 10.0.
1.0
VPN or ISDN
connection
