현재의 VPN 제품들은 단말의 IP 이동성을 지원하지 못하고 있다. 단말의 이동 시 단말은 새로운 IP 주소를 할당받게 되는데, VPN 게이트웨이는 단말이 초기에 등록한 IP 정보만을 가지고 있기 때문에 이동한 단말이 전송하는 패킷을 폐기하게 된다. 본 논문에서는 VPN 세션의 단절 없이 단말의 이동성을 지원하는 VPN 게이트웨이를 설계하고 구현하였다. 본 논문에서 설계한 VPN 게이트웨이는 IPv6 기반 네트워크에서 동작하며, 단말의 이동성을 지원찰기 위해 Mobile IPv6 기술과 VPN 기술을 통합하는 구조를 갖는다.
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