Lancom Systems LCOS 3.50 Manuel D’Utilisation
LANCOM Reference Manual LCOS 3.50
Chapter 14: Virtual Private Networks—VPN
326
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VP
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The entries for the ISDN connection are needed for the transmission
of the actual dynamic IP address solely. The Internet access wizard
configures the connection to the Internet.
of the actual dynamic IP address solely. The Internet access wizard
configures the connection to the Internet.
Alternatively, this application can be solved with the help of dynamic
DNS. Instead of a static IP address, a dynamic DNS name helps to find
the dynamic IP address that is currently in use. More information is
available under ’Dynamic IP addresses and DynDNS’
DNS. Instead of a static IP address, a dynamic DNS name helps to find
the dynamic IP address that is currently in use. More information is
available under ’Dynamic IP addresses and DynDNS’
14.7
How does VPN work?
In practice, a VPN must fulfill a number of requirements:
Unauthorized third parties must not be able to read the data (encryption)
It should not be possible to manipulate the data (data integrity)
Unambiguous identification of the sender of data (authentication)
Simple key management
Compatibility to VPN devices from a variety of manufacturers
LANCOM VPN achieves these five major goals by applying the widely used
IPSec standard.
IPSec standard.
Entry
Headquarters
Branch_office
Type of local IP address
dynamic
dynamic
Type of remote IP address
dynamic
dynamic
Name of the local device
Headquarters
Branch_office
Name of the remote device
Branch_office
Headquarters
ISDN-calling number of the remote
device
device
06954321
03012345
ISDN-caller ID of the remote device
06954321
03012345
Password for the secure
transmission of the IP address
transmission of the IP address
confidential
confidential
Shared Secret for encryption
secret
secret
IP-network address of the remote
network
network
10.10.2.0
10.10.1.0
Netmask of the remote network
255.255.255.0
255.255.255.0