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Bypassing Firewalls Using Negotiation Server and Port Prediction

Bypassing Firewalls Using Negotiation Server and Port Prediction. Negotiating Unsolicited Connections to a Service Listening Behind a Firewall Ben Stroud CS525 Spring 10. Presentation Outline. So What is the Problem Anyway? How Port Prediction Works Implementation Issues Success Rates

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Bypassing Firewalls Using Negotiation Server and 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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