Lancom Systems LCOS 3.50 - Manual (Page 324)

LANCOM Reference Manual LCOS 3.50 ̈ Chapter 14: Virtual Private Networks—VPN
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Headquarters has a fixed, static address. When the connection is set up,
Branch office transmits its actual IP address to Headquarters. This is
accomplished by a special ICMP packet (alternatively UDP, port 87).
14.6.3 Static/dynamic (with LANCOM Dynamic VPN)
In this case (other than the example above), the peer with the static IP address
initiates the VPN connection.
The VPN gateway Headquarters initiates a VPN connection to Branch
office. Headquarters has a static IP address, Branch office a dynamic one.
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.
Entry Headquarters Branch_office
Type of local IP address static dynamic
Type of remote IP address dynamic static
Name of the local device Headquarters Branch_office
Name of the remote device Branch_office Headquarters
Password for the secure
transmission of the IP address confidential confidential
Shared Secret for encryption secret secret
IP address of the remote device – 193.10.10.1
IP-network address of the remote
network 10.10.2.0 10.10.1.0
Netmask of the remote network 255.255.255.0 255.255.255.0
Headquarters Branch_office
LAN 10.10.1.x LAN 10.10.2.x
VPN tunnel
Static IP address
Private IP 10.10.1.1
Public IP 193.10.10.1
ISDN no. (030) 12345
ISDN identifier 03012345
Dynamic IP address
Private IP 10.10.2.1
ISDN no. (069) 54321
ISDN identifier 06954321
ISDN
Internet