| Publisher | BBN Technologies | ||
|---|---|---|---|
| Format | 107.4KB PDF, requires Acrobat Rdr 5 | Date added | 29 Oct 2004 |
| Topics | IP Technologies | ||
| Downloads | 22 | ||
The Source Path Isolation Engine (SPIE), developed at BBN, provides accurate tracing of single IP packets through a network. The SPIE system calculates several small hash values for each packet as it traverses a router, then stores these values in a data structure called a Bloom filter. Given a packet and an approximate time that packet was in the network, the SPIE system queries routers along the potential reverse path; a packet was "seen" at a router if the Bloom filter has stored the packet's hash values.
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