LANCOM 1722 VoIP – LANCOM 1724 VoIP
Chapter 7: Providing dial- up access
110
EN
7.1.2
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
same applies in the other direction as well: computers in the LAN will also be
able to access the remote machine.
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
