Microsoft Network Monitor 소켓모니터링

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첨부파일(압축)
Network Monitor (Netmon)는 네트워크 프로토콜 트래픽 분석 유틸리티입니다. Network Monitor 3.1 을 사용해서 네트워크 프로토콜을 수집하는 몇 가지 방법을 정리하였습니다.

Netmon 2.x와 3.x의 가장 큰 변화는 캡쳐 필터링이라고 생각합니다. 캡쳐 필터링 옵션 변화에 따른 패킷 수집 방법을 사례 별로 아주 기본적인 테스트를 해 봅니다. 
일반적으로 Netmon 트래픽을 수집하기 위해서는 Client와 Server 측에서 함께 로그 수집을 해야 문제 해결을 위한 보다 정확한 데이터를 얻을 수 있습니다.
아래 그림은 Netmon 3.1 인터페이스입니다. Catpure Filter 제어, Frame Summary, Frame Details, Hex Details 값을 바로 확인할 수 있습니다.
Capture Filter 에 Filter 구문을 작성한 뒤 반드시 Verify, Apply 하여 체크 및 필터를 적용해야 합니다.

사용자 삽입 이미지




[환경] Server : 192.168.0.100
Client : 192.168.0.133

Case 1. 특정 Source IP Address(192.168.0.133) 에서 유입되는 Packet 확인

IPv4.SourceAddress == 192.168.0.133

Client 에서 Server 로 터미널 서비스 접속을 시도 하였습니다.

사용자 삽입 이미지


Case 2. TCP Source Port 가 3389인 frame 확인

Tcp.Port == 3389

Client 에서 Server 로 터미널 서비스 접속을 시도 하였습니다.

사용자 삽입 이미지


Case 3. 3389 port Packet은 캡쳐하지 않음

Tcp.Port != 3389

터미널 서비스 3389 포트 커넥션을 시도 하였으나 아래 그림과 같이 캡쳐되지 않습니다.

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Case 4. ARP Packet 찾기

ARP
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Case 5. Source Port 1096, Destination Port 3389 과 일치하는 Packet

Tcp.SrcPort == 1096 AND Tcp.DstPort == 3389
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Case 6. Command 명령을 이용한 Packet 수집

C:\Program Files\Microsoft Network Monitor 3\> nmcap /network * /capture /File client.cap:10M

모든 패킷을 수집하는 명령입니다. 수집이 완료되면 Ctrl + C 를 입력하여 수집을 중지합니다.

사용자 삽입 이미지

 
자, 수집을 하셨으니 이제 분석을 해야겠죠? 누가하죠? 어떻게?…. What?
약은 약사에게 패킷 분석은 전문 분석 엔지니어에게 ^^
 

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