21번 - IP 프로토콜 필드http://ddooooki.tistory.com/17 22번 - netstathttp://mainia.tistory.com/5378 23번 - IDS 탐지기법http://visu4l.tistory.com/158 24번 - IPv6 특징http://withhuni.blogspot.com/2010/07/ipv6%EB%9E%80-%EB%AC%B4%EC%97%87%EC%9D%B8%EA%B0%80.html 25번 - NAChttps://www.boannews.com/media/view.asp?idx=66403 26번 - IDS 탐지기법시그니처 기반 탐지기법http://blog.naver.com/darksaking/220187518490 27번 - netstat TCP 상태값http:..