Along with the broadband popularization, the network security and the related ap-plication is getting progressively importantly. How to establish a secret channel for re-mote user to transfer the secret information has become an important task.
Globalization in industry epoch has already arrived. VPN has become a crucial op-tion for enterprise and coordination purpose. Information, data transmission, remote controlling, management are increasing in enterprises. Communication between office are inevitable among all. If those things can be dealt by network, it not only facilitates the work but also lowers the operation cost.
Generally speaking, single layer VPN allows to connect to LAN within the intranet. However, DMZ's storage is unable to connect to LAN. It needs to access to other's in-tranet first before DMZ and this structure might be cause a security threat to two sides' intranet. Therefore, single layer VPN is no longer satisfied with multi-nations coporate's need. Multiple layer VPN is required.
When you need to transfer data or information in “Lan to Lan”,”Lan to DMZ”,”DMZ to DMZ”, the multiple VPN is a more flexible structure.
