How to Inspect GRE Tunnel Traffic with Cisco Secure Firewall Threat Defense скачать в хорошем качестве

How to Inspect GRE Tunnel Traffic with Cisco Secure Firewall Threat Defense

In this episode, Cisco instructor Mark Brereton demonstrates how to inspect GRE tunnel traffic using Cisco Secure Firewall Threat Defense (FTD). Learn how to leverage packet capture, packet tracer, and prefilter policies to analyze and control GRE-encapsulated traffic traversing your network. Mark walks through a real-world network setup, shows how to verify GRE traffic, configures tunnel inspection rules, and explains how firewall access control can block or allow specific tunnel destinations. Perfect for network engineers looking to enhance their firewall’s traffic inspection capabilities. Chapters 0:17 Overview of the Network Topology 1:19 GRE Tunnel Configuration and Endpoints 2:14 Cisco Secure Firewall’s Role in GRE Traffic 2:46 Demo: Verifying GRE Tunnel Traffic 3:34 Using Packet Capture and Packet Tracer 7:59 Analyzing Events with Unified Events 9:19 Creating a Prefilter Policy for GRE Inspection 11:00 Modifying Access Control Rules 12:57 Deploying and Testing the New Rules 13:34 Demonstration: Blocking and Allowing Traffic 14:18 Reviewing Results and Conclusion Steps Overview: 1. Review the network topology and GRE endpoints. 2. Verify GRE tunnel traffic using packet capture and tracer tools. 3. Analyze events to observe how current rules treat GRE-encapsulated packets. 4. Create and apply a prefilter policy with a tunnel rule for GRE traffic. 5. Update access control rules to allow or block specific destinations based on GRE inspection. 6. Deploy configuration changes. 7. Test communication to verify rule enforcement. 8. Analyze events and packet traces to confirm correct operation. ✨ Subscribe for more tech videos! @CiscoUtube ✨ Create a Cisco U. Free Account: http://cs.co/9001OQtCx