Demystifying Firewalls Your Ultimate Guide

@DemystifyTech
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Demystifying Firewalls: Your Ultimate Guide by @DemystifyTech

OUTLINE:

00:00:00 The Importance of Firewalls in Network Security
00:01:05 The Functionality of Firewalls in the OSI Model
00:02:00 The Principle of Implicit Deny and Conclusion
00:02:51 End Sting

**Simplified Instructions for Getting Started:**

1. Open the provided workspace below.
2. Install fwbuilder software: Run `apt-get install fwbuilder` in your terminal.
3. Launch the workspace in DESKTOP mode.
4. Find and launch Firewall Builder in the application menu.

**For Configuration:**

5. Create objects as needed for the objectives.
6. Use "Library Standard" for pre-configured objects.
7. Compile the exportable firewall rules by clicking the hammer icon in the top-right corner.

**Scenario:**

You are setting up a firewall for an internal network with the following specifics:

- Firewall runs on a Linux server using iptables on Linux 2.4/2.6.
- All network objects share a single network interface (e.g., eth0).
- The web server (192.168.1.200) allows incoming traffic on TCP/80 and TCP/443 (http/https) from anywhere.
- The LDAP server (192.168.1.100) allows incoming traffic on TCP/389 and TCP/663 (ldap/ldaps) from addresses in the 192.168.1.0/16 range.
- The web server (192.168.1.200) allows incoming traffic on TCP/22 (SSH) from IP addresses in the range 64.233.160.0 – 64.233.191.255.
- All outbound (established) connections are allowed from anywhere to anywhere.
- Inbound traffic to the IP address range 192.168.1.0-192.168.2.255 is denied by default.
- All other inbound and outbound traffic is also denied by default.

Now you're ready to configure your firewall!

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#NetworkSecurity #FirewallConfiguration #TechTutorial