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Linux Network Security
- 1. Linux Network Security Amr Ali Software Freedom Day 2010
- 3. A monolithic kernel
- 4. It is a UNIX based operating system
- 5. Very flexible modular system
- 6. Has a “penguin” as a mascot
- 7. Easily customizable at all levels
- 8. Can be installed on potatoes
- 10. The user has full control in great details
- 11. Its security is state of the art
- 12. Scalable and can manage organizations of any size
- 14. By far is the most used firewall on Linux based systems, and second most used firewall on UNIX systems that utilize different kernel
- 15. Usually works on the Transport and the Internet layers
- 17. Very system/network administrator friendly
- 18. Detects and blocks attempts of network reconnaissance
- 19. Logs unauthorized access based on allowed ports
- 20. Helps in defeating D/DoS attacks
- 21. IPv6 and 6to4 ready
- 22. How xFirewall works? System Reckon? Attack? xFirewall Linux Based System
- 24. TCP connect scan
- 25. UDP scan
- 26. XMAS scan
- 27. NULL scan
- 28. FIN scan
- 30. “ IPv6|::|tcp|22,23” will allow incoming connections from anywhere to TCP ports 22 and 23
- 31. “ IPv4|0.0.0.0|udp|53” will allow incoming connections from anywhere to UDP port 53
- 33. UnTar the package, read the `README' file, so you would know how to install it properly
- 34. Finally edit the configuration file, save it, and issue `sudo /etc/init.d/xfirewall start'
- 35. Attacker Point of View Starting Nmap 5.00 ( http://nmap.org ) at 2010-08-10 15:58 EEST NSE: Loaded 59 scripts for scanning. Initiating SYN Stealth Scan at 15:58 Scanning 192.168.1.100 [1000 ports] Discovered open port 3306/tcp on 192.168.1.100 Discovered open port 587/tcp on 192.168.1.100 Discovered open port 25/tcp on 192.168.1.100 Discovered open port 110/tcp on 192.168.1.100 Discovered open port 113/tcp on 192.168.1.100 Discovered open port 8888/tcp on 192.168.1.100 Discovered open port 8080/tcp on 192.168.1.100 Discovered open port 111/tcp on 192.168.1.100 Discovered open port 995/tcp on 192.168.1.100 Discovered open port 199/tcp on 192.168.1.100 Discovered open port 6699/tcp on 192.168.1.100 Discovered open port 19350/tcp on 192.168.1.100 Discovered open port 9535/tcp on 192.168.1.100