Remote Packet Capture Internet Engineering Task Force San Diego, California Friday, June 03, 2016

3 June 2016 Problem Accessing packets of interest is difficult Existing technology is/are becoming inadequate –RMON filter/capture Constrained by resources Pull technology –SMON port copy Full duplex port replication suffers from congestion issues, which impact packet capture reliability Full packet replication limits what you can do with captured stream Distributed monitoring makes the problem even more interesting

3 June 2016 Need An improved packet capture paradigm –Designed as a service? Simple Standardizable Assured operation –Support existing IPPM metrics Type-P* metrics Path determination –Facilitate/enable new measurements

3 June 2016 PCAP Requirements Integrated high performance packet capture –Reliable/sustained stream capture Flexible packet selection strategies Support IPPM framework and metrics –RFC 2330 Framework for IP Performance Metrics –RFC 2678 IPPM Metrics for Measuring Connectivity –RFC 2679 A One-Way Delay Metric for IPPM –RFC 2680 A One-Way Packet Loss Metric for IPPM –RFC 2681 A Round-trip Delay Metric for IPPM Minimize privacy impact

3 June 2016 Application Enhanced SMON Port Copy Facility Full ICMP Packet Capture + Timestamp IP + Transport Header Capture + Pkt Len + Timestamp MPLS Label Capture + Pkt Len + Timestamp

3 June 2016 Applications IPPM Type-P* “Whatever” Metrics Monitor Switch End system End system IP + Transport Header Capture + Pkt Len + Timestamp Full ICMP Packet Capture + Timestamp

3 June 2016 Recommendations Integrated packet filter/capture –Devise a simple strategy –that is high performance friendly (OC-192) Exploit benefit of SMON PortCopy –Get packet off the box as soon as possible Address SMON PortCopy congestion issues –Partial packet capture Variable packet header capture Label capture Enable better packet dispostion –Capture packet encapsulation and transport

3 June 2016 Approach Packet Capture encapsulation header –Support Distributed Multipoint Monitoring Source identification –Source component identifier –Interface identifier –Direction –Assured packet capture Sequence numbering –IPPM Conformant Timestamp –Variable length capture payload Captured packet transport –Layer 2 transport –Layer 3 transport

3 June 2016 Draft PCAP Header | Source Identifier | | ifIndex | Interface Type | | Status | Length | | Sequence Number | | Time Stamp (sec) | | Time Stamp (nsec) | | | | Captured Packet Data | | |

3 June 2016 Privacy Packet capture perceived as threat to privacy Selective/partial packet capture –Protocol Specific Content separation Authorized content capture Limited header capture –Captured content protection Unauthorized modification Unauthorized disclosure