No abstract

Nowadays, many people are devoting attention to Virtual Private Network (VPN), which is a method for private network construction on an open network like the Internet. To enhance security in the private network, IT managers design internal VPNs for sections. Therefore, the IT managers and users of network applications need to assume environments that have multiple firewalls on the communication path. In this paper, we propose a VPN construction method suited to a multiple firewall environment. In our proposed method, each firewall has an end-toend encryption function and a relay control function. The user does not need to be conscious of multiple firewalls with this environment, and by means of this method, we can make a VPN that provides for communication performance under these functions.