Using Firewall Builder, Part II
Figure 5 shows Slartibartfast's global policy; because this article is already too long I won't explain it in-depth. But the whole point of Firewall Builder is to display firewall rules in an easy-to-read format, so Figure 5 should be self-explanatory.
Speaking of self-explanatory, did I mention that all rules, whether loopback, anti-spoofing or global, can be generated quickly and automatically using Firewall Builder's policy druid? You can run it by selecting a firewall object, pulling down the Rules menu and selecting Help me build a firewall policy.
Don't get too irked at me for not mentioning this until after making you slog through all my instructions on building policies the hard way. Firewall rules are too important to trust entirely to druids. Hopefully, you now can understand and tweak or even correct the rules Firewall Builder generates for you. Regardless of how you build your policies, I hope you find Firewall Builder as useful as I have.
Mick Bauer, CISSP, is Linux Journal's security editor and an IS security consultant for Upstream Solutions LLC in Minneapolis, Minnesota. Mick spends his copious free time chasing little kids (strictly his own) and playing music, sometimes simultaneously. Mick is author of Building Secure Servers With Linux (O'Reilly & Associates, 2002).
|Secure Server Deployments in Hostile Territory, Part II||Jul 29, 2015|
|Hacking a Safe with Bash||Jul 28, 2015|
|KDE Reveals Plasma Mobile||Jul 28, 2015|
|Huge Package Overhaul for Debian and Ubuntu||Jul 23, 2015|
|diff -u: What's New in Kernel Development||Jul 22, 2015|
|Shashlik - a Tasty New Android Simulator||Jul 21, 2015|
- Secure Server Deployments in Hostile Territory, Part II
- Hacking a Safe with Bash
- KDE Reveals Plasma Mobile
- Huge Package Overhaul for Debian and Ubuntu
- The Controversy Behind Canonical's Intellectual Property Policy
- Home Automation with Raspberry Pi
- Shashlik - a Tasty New Android Simulator
- Embed Linux in Monitoring and Control Systems
- diff -u: What's New in Kernel Development
- General Relativity in Python