Abstract
There exist a lot of security threats in WLAN environment, therefore it is not reliable. When using a service where security is a crucial factor in WLAN environment, it is mandatory to use a virtual private network (VPN). In WLAN environment, secure socket layer (SSL)-based host-to-gateway VPN is frequently used to protect user information from various attacks that can occur in unreliable wireless access point or wireless link. However, for existing methods, a VPN is applied in block to all packets of user applications, so there is a large overhead. This paper proposes a method for a VPN client to selectively use a VPN service according to the importance of network service type and security using the packet distributed processing method provided by netfilter framework of kernel. The paper also shows its usefulness through an experiment.
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