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Sampling and Filtering Techniques for IP Packet Selection

This draft discusses sampling and filtering techniques for selecting IP packets, covering topics such as hash functions, IPv6 and MPLS support, filter definition, and minor issues.

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Sampling and Filtering Techniques for IP Packet Selection

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  1. Sampling and Filtering Techniques for IP Packet Selection- Update - draft-ietf-psamp-sample-tech-04.txt Tanja Zseby, FhG FOKUS Maurizio Molina, NEC Europe Ltd. Fredric Raspall, NEC Europe Ltd. Nick Duffield, AT&T Labs

  2. Open Issue from last meeting • Open Issue: IPR on Hash Function • 2 mandatory hash functions • Potential IPR from AT&T • Now AT&T IPR statement: http://www.ietf.org/ietf/IPR/att-ipr-draft-ietf-psamp-framework.txt • Solution: Will include IPR statement in next version • Open Issue: Hash function support for IPv6 and MPLS • IPSX does not support IPv6 • Solution: other function ? additional function? Limit MUST to IPv4 ? draft-ietf-psamp-sample-tech-04.txt

  3. New Open Issue: Filter Definition • Currently low-level filter definition • Based on bitfield computation (masks, ranges) • Generic but complicates filtering definition, reporting • Problems with Info Model (see mail from Thomas Dietz)  High level filter definition needed • Proposal: Call for proposals to express complex filters • If no suitable proposal (within next 3 weeks)  Use simple definition + vendor extensions • Filter based on IPFIX fields • only AND operation • no OR operation • no ranges • Everything else vendor specific • Substitute current definition draft-ietf-psamp-sample-tech-04.txt

  4. Minor Issues • Some Restructuring • Move sampling schemes (3.1) from scope (section 3.) to new section on sampling (new section 4) • PSAMP and IPFIX: combine text from terminology and scope section into new section or just add reference ? • Allow concatenated selector IDs • To express combinations of selectors • Add example for stratified sampling • Double-check consistency with new FW draft • Some minor changes (terms in upper case, typos, etc.) draft-ietf-psamp-sample-tech-04.txt

  5. Thank you for your attention ! Questions ?

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