Lancom Systems 1621, 821, 1711 manual Settings for TCP/IP, The ISDN calling line identity CLI

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LANCOM 821 ADSL/ISDN – LANCOM 1621 ADSL/ISDN – LANCOM 1711 VPN

Chapter 6: Providing dial- up access

The ISDN calling line identity (CLI)

The ISDN caller ID—also known as CLI (Calling Line Identity)—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).

6.1.2Settings for TCP/IP

Each active RAS user must be assigned an IP address when using the TCP/IP protocol.

	LAN of the head office.
	IP: 10.0.1.0
	Remote
	workstation
	IP:
	10.0.1.101
	VPN or ISDN
	connection
	ISDN adapter
10.0.1.100	User: 'SAMPLE'
(0123) 123456	(0123) 777888

This IP address can be permanently assigned when setting up a user. However, it is simpler to let the LANCOM 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 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.

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