Build Your Own Firewall

1
Build Your Own Firewall
2
Why, What How

• Why
• Hardware vs. Software
• Existing vs. Custom
• Customer Specifications
• Set rules Easy Interface

3
What Basic Features

• Packet Filter
• DHCP
• Proxy Cache
• Content Filter
• Perimeter IDS
• Network Monitor
• Bandwidth Control

4
How Simple Steps

• Choose Base Distro
• Trim
• Customise
• Test

5
Custom Distro

• Chose familiar
• Secure Harden
• Package Management
• Updates
• Backup Restore

6
Iptables Ruleset

• Several Examples to choose from
• Customise
• Adapt

7
Interface

• vi/text editor
• web-based
• ncurses
• gui

8
PC/Appliance

• Form Factor
• No moving parts (low maintenance)
• Performance
• Cost

9
Future

• Scripts only
• Complete Distro
• More features

10
Credits

• Dr. GR Bhat
• Dhruv Gami
• Prateek Khanna
• Shekhar Govindrajan

11
Useful Resources

• www.netfilter.org
• www.linuxguruz.com/iptables
• 256.com/gray/docs/rh_boot/

12
Thank You!
kishore_at_linkaxis.com