System and method for forming virtual private network

A system for forming a VPN that supports mobility with a connection node having a virtual home address (HoA) and a care of address (CoA), the system comprising:

• a virtual address converter that generates, when a packet which is a private network internal address corresponding to the virtual HoA of the connection node as a destination address is transferred from a service server within the VPN to the connection node, a first restoration packet by restoring the private network internal address to the virtual HoA of the connection node;
• a data security unit that encodes the first restoration packet;
• and
• a mobility support unit that detects the virtual HoA of the connection node from the encoded first restoration packet and that generates a second restoration packet by inserting the CoA for the virtual HoA.

A method of forming a VPN that supports mobility with a connection node having a virtual home address (HoA) and a care of address (CoA), the method comprising:

• generating, when a packet is transferred from the connection node, a first conversion packet by processing a mobility tunnel for the packet;
• performing a security test of the first conversion packet;
• and
• generating a second conversion packet by converting the virtual HoA of the connection node, which is a source address of the first conversion packet in which the security test is complete, to a private network internal address that can be used in the VPN.

A method of forming a VPN that supports mobility with a connection node having a virtual home address (HoA) and a care of address (CoA), the method comprising:

• receiving, when a packet which is a private network internal address corresponding to the virtual HoA of the connection node as a destination address is transferred from an internal service server of the VPN to the connection node, the packet from the internal service server;
• generating a first restoration packet by restoring the private network internal address to the virtual HoA of the connection node;
• to encoding the first restoration packet and detecting the virtual HoA of the connection node from the encoded first restoration packet;
• and
• generating a second restoration packet by inserting the CoA corresponding to the virtual HoA of the connection node in the first restoration packet.