IPv6 초기 도입단계에서는 IPv4와 IPv6 (Internet protocol version 6)의 혼용이 예상됨에 따라 초기 IPv6 네트워크는 기존 IPv4와의 연동 및 호환을 위해 트랜지션 (transition) 메커니즘과 상호공존 (coexistence mechanism) 메커니즘을 필요로 한다. 이를 위해 다양한 트랜지션 메커니즘들이 제안되고 있는데 크게 터널링 (tunneling)과 변환 (translation) 방식으로 구분할 수 있다. 본 논문은 이러한 메커니즘 중에서 터널링을 이용한 DSTM (dual stack transition mechanism)을 분석한 후 제안된 DSTM의 각 연결별 임시 IPv4 주소할당에 대한 비합리적인 문제점을 개선한 모델을 제시하였다. 본 논문예서 제안한 모델은 기존의 NAT (network address translation) 방식과 유사하게 단일 IPv4 주소와 포트 넘버를 이용하여 각 연결을 식별할 수 있도록 한다. 그리고 DSTM 시스템 구현을 위한 효율적인 알고리즘 설계를 통해 IPv4 패킷을 IPv6 패킷으로 캡슐화 (encapsulation)하여 전송할 수 있는 인터페이스를 구현하여 결과를 분석하였다.
KSP Keywords
Internet Protocol(IP), Internet Protocol Version 6, Network Address Translation, coexistence mechanism, dual stack, transition mechanism
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