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Traffic Processing in the Internet

Traffic Processing in the Internet. Dr. Ian Brown (Dr. Ken Carlberg) University College London. Requirements Structure IEPREP WG. General Requirements. SIP Resource Header. IP Telephony Requirements. Informational Mapping. MLPP. Future Requirements?. IP Telephony Framework. HPC

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Traffic Processing in the Internet

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  1. Traffic Processing in the Internet Dr. Ian Brown (Dr. Ken Carlberg) University College London

  2. Requirements StructureIEPREP WG General Requirements SIP Resource Header IP Telephony Requirements Informational Mapping MLPP Future Requirements? IP Telephony Framework HPC (NS/EP) SMTP IAA H.460.4

  3. Requirement Areas Signaling Labels Policy Probability Authorization Integrity Authentication Confidentiality Issues Accounting Admission Control Digital Signatures General Requirements

  4. Requirements Label support for signaling Extensible labels Mapping of labels Accounting Issues Alternate paths IP Telephony Requirements

  5. Network Perspectives(Priority Treatment) • Near Term • Intra-domain • Inter-domain: access links • Inter-domain: between ISPs • Mid-Term • Over-lay networks

  6. Over-provisioned links VPN MPLS labeled paths RSVP/Int-serv Isolated segment within a domain IntraDomain(near term) • Note: 2 through 4 may be done at leaf ISP, or large enterprise networks. Tier-1 networks rely on over-provisioning

  7. Access Links Diff-serv AF for signaling EF for VoIP/video Potential use of AF for emergency labeled data WFQ/CBQ Inter-ISP Overprovisioning at Tier-1 Class-based WFQ at Tier-2 & 3 Aggregates of VoIP or video InterDomain(near term) • Note: in either case, BGP will not be augmented to support priority routing

  8. Beyond Network Layer • Gateways • Alternate gateways via TRIP • Mapping of labels from ITU, IETF, T1 • Forward Error Correction (FEC) • Duplicate packets • e.g., UCL RAT audio tool using different codecs • Reconstruction packets • Interleaving of packets (1,3,2,4,5…)

  9. Beyond Network Layer(cont.) • Distributed Content Architecture • e.g., Akamai

  10. Future Efforts • Increase of Multi-homed networks • Operational issue/decision • Overlay Networks • New Service models • Policy-based degraded service • Help Bridge wireless networks such as Land Mobile Radio • New diff-serv code points representing new forwarding models

  11. Future Efforts(cont.) • IPv6 • Its not the silver bullet • IPv4 is the installed base and must be primary focus • eg, diff-serv code points field is same for IPv4 and IP6 • Has great potential for maintaining end-to-end model using portable devices (e.g., soft-phones)

  12. Challenges • Routing • Firewalls, NATs, PATs • Educating ISPs and users • Understanding what is being asked, what can be done, and what is available

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