32비트의 IPv4 주소고갈의 문제를 해결하고 보안과 QoS를 확실히 보장해 주기 위해 등장한 IPv6는 특성상 128비트로 증가된 주소공간과 네트워크를 효율적으로 관리하기 위한 주소체계, 이웃 탐색 및 주소 자동 설정 등 다양한 서비스 제공을 위해 노드와 라우터간의 주고받는 새로운 메시지들이 많이 추가되었다. 결과 IPv4에서 존재하던 공격은 물론 예측하지 못했던 새로운 공격들이 많이 등장하게 된다. IPv4에서 성공적으로 IPv6로 전환하기 위해 무엇보다 필요한 것은 안전하고 체계적인 보안 정책기반 아래 기존에 동작되고 있는 IPv4 호스트 및 라우터와 IPv6의 안전한 호환성이다. 따라서 관리자는 앞으로 도래 할 IPv6 네트워크 환경을 효율적으로 관리하기 위해서 다양한 측면에서 보안 문제를 도출하여 통합적인 보안 대응 방안을 설계해야 한다. 본 논문에서는 IPv4와 IPv6의 특성을 파악하고, IPv4/IPv6에서의 공격 측면에서 보안 취약성 분석 및 보안 문제를 도출하여 시스템 측면, IPv6 특성별 측면, 개선된 CGA인 MCGA (Modified Cryptographically Generated Address)의 제안을 통해 IPv6에서의 효율적인 보안 관리를 위한 통합적인 대응방안을 제시한다.
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