It is also possible to establish a connection between two stations using dynamic IP addresses by using so-called dynamic DNS services (DynDNS). The address of the tunnel end-point is not defined as an IP number (which is, of course, dynamic and subject to frequent change) but as a static name instead (e.g. MyLANCOM@DynDNS.org).
Two things are needed for translating a name to its current IP address: A dynamic DNS server and a dynamic DNS client:
- The first, available from numerous providers in the Internet, is a server that is in communication with Internet DNS servers.
- The dynamic DNS client is integrated in the device. It can make contact to any one of a number of dynamic-DNS service providers and, assuming that a user account has been set up, automatically update its current IP address for the DNS name translation. This can be set up very conveniently with a Wizard under LANconfig (also see ):
Note: For reasons of security and availability,
LANCOM Systems recommends the use of Dynamic VPN in preference to dynamic
DNS-based VPN solutions. Dynamic VPN is based on direct connections via
the ISDN network and ensures a higher degree of availability than dynamic
DNS services in the Internet.