BGP Flow Specification:BGP流程规范.pdf

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BGP Flow Specification Deployment Experience Derek Gassen, Raul Lozano Time Warner Telecom Danny McPherson, Craig Labovitz Arbor Networks Agenda • Flow Spec Overview • About TWTC • DDOS problem and Observations • Previous Mitigation Approaches • Experiences with Flow Spec • Futures 1 Flow Spec Overview The Problem: Providers have limited options for mitigating DDoS attacks internally and inter- provider, e.g: – BGP destination black-holes: completes the attack – BGP src/uRP: difficult for some spoofed attacks and/or support large numbers of sources – ACLS: difficult to maintain and occasionally dangerous to install 2 Flow Spec Basic idea: Use BGP to distribute flow specification filters and dynamically filter on routers. 3 Flow Spec • Encode flow specification rules as new BGP NLRI address family. • BGP itself treats the FlowSpec NLRI as an opaque key to an entry in its database. • Use extended communities to specify action (accept, discard, rate-limit, sample, redirect). • Match on combination of source/dest prefix, source/dest port, ICMP type/code, packet size, DSCP, TCP flag, fragment encoding, etc. Example: all TCP port 80..90 packets to 192.168.0/24. 4 Flow Spec Trust Model • Unicast routing advertisements control traffic gets forwarded. • Consider a filter as a “hole” in the aggregate of traffic that is being forwarded to a destination prefix. • Accept filter when advertised by next-hop for the destination prefix. 5 Flow Spec Benefits • Fine grain specification of filters with BGP’s ease of deployment/management – BGP solves distribution and trust problem • Leverage ASIC filtering in routers.

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