Security in the post internet era II

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  • 1.uw network security2003 Terry Gray University of Washington Computing & Communications 17 October 2003
  • 2.UW campus network (backbone) border router border router backbone switches ~ 30 level one routers subnets (733 total; 150 c&c); over 60,000 live devices
  • 3.UW campus network (typical subnet) Level One Router Aggregation Switch Edge Switch Edge Switch Edge Switch campus subnets are a mixture of shared 10Mbps switched 10Mbps switched 10/100Mbps
  • 4.network facilities
  • 5.typical core routers
  • 6.campus network traffic
  • 7.Pacific Northwest Gigapop The PNW’s access point to next generation Internets, including Internet2, high performance USA Federal Networks, and high speed commodity Internet A high speed peering point for regional and international networks R&D testbed inviting national and international experimentation with advanced Internet-based applications
  • 8.
  • 9.Pacific Northwest Gigapop uw border uw border 3 diverse network providers Internet2 national & internat’nl nets Internet2 2.5Gbps (10Gbps upgrade underway) Three different 1Gbps connections to the Internet Multiple gigabits of connections to other networks 30+ network customers
  • 10.K-12 (307) Community/Technical College (73) Public Baccalaureate (50) Library (65 in process) Independent Colleges (9 approved) K20 Network Sites
  • 11.seven security axioms Network security is maximized when we assume there is no such thing. Large security perimeters mean large vulnerability zones. Firewalls are such a good idea, every computer should have one. Seriously. Remote access is fraught with peril, just like local access. One person's security perimeter is another's broken network. Isolation strategies are limited by how many PCs you want on your desk. Network security is about psychology as much as technology. Bonus: never forget that computer ownership is not for the feint-hearted.
  • 12.credo focus first on the edge(perimeter protection paradox) add defense in depth as needed keep it manageable provide for local policy choice... avoid one-size-fits-all
  • 13.gray’s defense-in-depth conjecture MTTE (exploit) = k * N**2 MTTI (innovation) = k * N**2 MTTR (repair) = k * N**2where N = number of layers
  • 14.C&C security activities logical firewalls project 172 network infrastructure protection reverse IDS (local infection detection) auto-block; self-reenable traffic monitoring tools who/where traceability tools nebula proactive probing honeypots security operations training; consulting