꿈꾸는 개발자 꿈꾸는 개발자

분류 전체보기

• ARP Cache

  Security in CPS/Networking 2019. 10. 18. 09:40

  다음 명령어를 통해 로컬에 저장되어 있는 ARP 캐쉬 정보를 확인할 수 있습니다. $> arp -n 1 2 3 4 5 $> arp -n Address HWtype HWaddress Flags Mask Iface 10.0.1.138 ether 00:00:00:00:00:01 C r1-eth0 10.0.2.10 ether 00:00:00:00:00:02 C r1-eth1 http://colorscripter.com/info#e" target="_blank" style="color:#4f4f4ftext-decoration:none">Colored by Color Scripter

  Read More
• [Problem] No SYN,ACK in TCP 3-ways handshake

  Security in CPS/Networking 2019. 10. 15. 08:53

  [Problem] A Client can not receive SYN,ACK packet from A Remote Server even though it can successfully do PINGs between them. Environment: Customized Mininet Topology [Check Point] 1. Capture TCP packets on a virtual ethernet. 2. The port is open or not 3. Firewall in a host is working or not

  Read More
• [VMWare] No space left on device

  Engineer/Linux 2019. 9. 24. 10:01

  하드디스크 용량 부족으로 VMWare Setting 에서 확장시켰더라도 VM에 바로 적용이 되지 않습니다. 사용하고 있는 OS 의 디스크 관리 툴을 이용해 별도의 설정을 해야 증가시킨 하드디스크 용량을 확인할 수 있습니다. Ubuntu 의 경우 Disks 에서 기존 사용하던 파일시스템의 세팅에서 Resize 해야 합니다.

  Read More
• [아파치] 커스텀 모듈 빌드 및 로딩

  Security in CPS/Networking 2019. 9. 4. 11:05

  https://httpd.apache.org/docs/2.4/programs/apxs.html Welcome! - The Apache HTTP Server Project The Number One HTTP Server On The Internet The Apache HTTP Server Project is an effort to develop and maintain an open-source HTTP server for modern operating systems including UNIX and Windows. The goal of this project is to provide a secure, efficient an httpd.apache.org 1. 더미 모듈을 생성한다. $> apxs -g -n..

  Read More
• [apache2] build apache2 (httpd)

  Security in CPS/Networking 2019. 9. 4. 10:55

  http://httpd.apache.org/docs/current/install.html Welcome! - The Apache HTTP Server Project The Number One HTTP Server On The Internet The Apache HTTP Server Project is an effort to develop and maintain an open-source HTTP server for modern operating systems including UNIX and Windows. The goal of this project is to provide a secure, efficient an httpd.apache.org 1. Download source code from the..

  Read More
• Install apache2 & check MPM on ubuntu

  Security in CPS/Networking 2019. 8. 28. 09:29

  1. Install apache server $> sudo apt-get install apache2 2. Run apache server $> sudo service apache2 start/restart/stop 3. Check apache server $> systemctl status apache2 4. Check wheither Multi-Processing Module is loading. 1 2 @ubuntu:/etc/apache2$ apache2 -V | grep MPM Server MPM: event 5. Check apache status 1 2 3 4 5 6 7 8 9 10 11 12 13 14 @ubuntu:/etc/apache2$ apache2 -S AH00558: apache2:..

  Read More
• [Tips] shell commands on mininet

  Security in CPS/MTD over SDN 2019. 8. 22. 10:14

  pingall dump net sh ovs-ofctl show s1 sh ovs-ofctl add-flow s1 action=normal sh ovs-ofctl dump-flows s1 RESULTS: cookie=0x0, duration=228.733s, table=0, n_packets=27, n_bytes=1890, actions=NORMAL sh ovs-ofctl del-flows s1 sh ovs-ofctl add-flow s1 priority=500,in_port=1,actions=output:2 sh ovs-ofctl del-flows s1 --strict sh ovs-ofctl add-flow s1 dl_src=00:00:00:00:00:01,dl_dst=00:00:00:00:00:02,a..

  Read More
• X11 forwarding in windows

  Engineer/Linux 2019. 8. 7. 14:36

  1. Download Xming application on window 2. Change the ssh configuration on linux(or target computer) $> sudo vi /etc/ssh/ssh_config X11Forwarding yes $> sudo service sshd restart 3. run putty and enable X11 forwarding [TroubleShooting1] qt.qpa.xcb: X server does not support XInput 2 failed to get the current screen resources QStandardPaths: XDG_RUNTIME_DIR not set, defaulting to '/tmp/runtime-ro..

  Read More