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TRIAD and Internet Addressing at the Edge

TRIAD and Internet Addressing at the Edge. Prof. David Cheriton Computer Science Department Stanford University. What is TRIAD?. NAT-based Internet Architecture end-to-end semantics highly scalable compatible with IPv4 extended directory services DARPA-sponsored project, Aug. 1999

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TRIAD and Internet Addressing at the Edge

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  1. TRIAD and Internet Addressing at the Edge Prof. David Cheriton Computer Science Department Stanford University

  2. What is TRIAD? • NAT-based Internet Architecture • end-to-end semantics • highly scalable • compatible with IPv4 • extended directory services • DARPA-sponsored project, Aug. 1999 • http://www-dsg.stanford.edu/triad.html

  3. TRIAD vs current NAT • Name-based E2E identification • DNS names, not end-to-end addresses • Reliable, secure router-integrated directories • End-to-end semantics • name-based pseudo-header for checksum • WRAP shim protocol for extended address • Intra-realm: normal IPv4 forwarding • Inter-realm: Translation and relaying Fixes problems with NAT, fixes the Internet

  4. TRIAD at the Edge:Similar to Current NAT Realms Realm 1 Internet Realm 2 • Intra-realm: IPv4 operation • Relay Agent (RA) - extended NAT device • local name service, private addrs alloc. Addressing at the edge: private addrs and locally-managed global names src RA1 RA2 dst2 dst1

  5. Relay Agent Functionality • NAT between local private addresses and global Internet addresses • Local addr. alloc. and auto-config, DHCP • Split DNS: • internal access to global names • external access to local names • Firewall protection from Internet • Monitoring and shaping for ISP SLA • Multi-home the edge net for availability

  6. Benefits • Edge: Autonomy, convenience, protection, control, low-cost IPv4 devices • ISP: charge per “global” address and per-user specified name suffix • customer takes responsibility for protection • Apps: app.-independent and soft-state • Internet: No need to make the transition to IPv6 routers, protocols, net. man. etc.

  7. Concluding Remarkshttp://www-dsg.stanford.edu/triad.html • Having a “border” to the edge is established • NAT, firewall, edge router • the flat and open Internet is long gone • Leverage the border device to: • insulate the core from edge naming and addressing requirements • support edge autonomy and configuration • TRIAD to regain transparency and application-independence thru the border.

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