Cisco Technology, Inc.

Mannesmann Aktiengesellschaft

Markus G Hies

Senthil M Sivakumar

Suresh Satapati

Helmut Oberheim

Michael Schambach

Norbert Haertelt

Herve Le Goff

A method for providing handling of data sent between a first network and at least a second network and a third network, wherein the first network is of a first protocol and the at least second and third networks are of a second protocol at least partially overlap is provided. A packet transmitted from the first network is received. The packet has a first address prefix if the packet is directed to the second network and has a second address prefix if the packet is directed to the third network. A destination address of the packet and a source address of the packet are translated from the first protocol to the second protocol. The packet is directed to the second network if the packet has the first address prefix. The packet is directed to the third network if the packet has the second address prefix.

Method and apparatus for providing IPv6 networks to communicate with overlapping IPv4 networks using NAT-PT

Economical and dependable networking of spatially separated branches of an organization is made possible for a plurality of individual subscribers with spatially separated branches by means of an arrangement and process for the operation of layer-3 virtual private networks (VPN A, VPN B) on a common data packet.communication network (e.g. OSI L3 data packet communication network ). A logical separation of the layer-3 VPNs (VPNA, VPNB) is accomplished by allocating disjoint partial address spaces of a given homogeneous total address space to these L3 VPNs. A virtual private network identification number VPN ID is assigned to each L3 VPN and used to identify the disjoint partial address space by forming a part of the address. The VPN ID characterizing the L3 VPN starts at a fixed bit position in the individual subscriber address of each individual subscriber of the L3 VPN and may have a variable or a fixed length. Secure separation of the L3 VPNs is implemented by filtering of routing information and/or data packets based on the VPN ID.

Process and apparatus for the operation of virtual private networks on a common data packet communication network

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Wiesbaden, Germany

Markus G Hies