In this paper, Wish to handle in priority about security of wishing to do data transmission between users specially among way to cope network service problems. Propose firewall that can solve problem of security between users for problematic solution, do so that can do smooth communication with network users sharing resource between each other safety in P2P environment. So that, users who is not given authority in network that consist through imperfect communication channel do not make a problem on security tapping, insertion and erasing of information, and rightful user through only firewall can use service.

Abstract
 1. 서론
 2. P2P와 방화벽
 3. 방화벽 시스템의 설계
 4. 방화벽 시스템의 구현 및 분석
  4.1 시스템 구현
  4.2 성능평가
 5. 결론
 참고문헌

• 이선호(초당대학교 정보통신공학과) | S. H. LEE
• 이호영(초당대학교 정보통신공학과) | H. Y. LEE