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Firewall Bypass using Negotiation & Port Prediction

Learn about bypassing firewalls using negotiation techniques & port prediction. This presentation outlines implementation issues, success rates, security concerns, and alternative solutions. Dive into the methods to negotiate unsolicited connections to access services behind firewalls. Discover how to overcome restrictions and open ports without manual configurations. Understand the challenges and solutions for implementing negotiation servers in large networks. Explore the success rates and limitations of this approach. Get insights into keeping an online streaming service accessible via distributed networks.

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Firewall Bypass using Negotiation & Port Prediction

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  1. Bypassing Firewalls Using Negotiation Server and Port Prediction Negotiating Unsolicited Connections to a Service Listening Behind a Firewall Ben Stroud CS525 Spring 10

  2. Presentation Outline • So What is the Problem Anyway? • How Port Prediction Works • Implementation Issues • Success Rates • Not Covering • Alternative Solutions • Security Concerns • Questions Stroud

  3. What is the Problem? • Firewalls will generally not allow unsolicited connections from the outside world into the “protected zone”. • To participate in peer to peer networks users have to open ports. • How to keep users from having to manually configure routers? Stroud

  4. Our Company Live Online Streaming of Television Via a Distributed Network Stroud

  5. Our Solution Stroud

  6. Implementation Considerations • For Large Networks Negotiation Server Must be very Robust • Overlapped I/O with large pool of sockets • UDT • TCP has additional considerations • Implementation this is based on used UDP • We still needed TCP delivery guarantees • TCP + UDP = UDT Stroud

  7. Success Rates • Able to bypass 95% of consumer level routers • Failures due to port prediction or bad connections? • Unable to predict random offsets • Won’t work on the Most Restrictive Networks • Confined to HTTP for inbound traffic Stroud

  8. Questions? Stroud

  9. References • See Full Report Stroud

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