US 7200105

Patent Overview: US 7,200,105 B1

Title: Systems and methods for point of ingress traceback of a network attack

Patent Number: US 7,200105B1 (as written in the supplied source: US7200105B1)

Application Number: US10/044,073

Inventors: Walter Clark Milliken; Luis A. Sanchez; Alex C. Snoeren

Original Assignee: BBN Technologies Corp.

Current Assignee (per source): RPX Corp; Tri County Excelsior Foundation

Key Dates: Priority date 2001-01-12; filing date 2002-01-11; publication/grant 2007-04-03. Status listed as "Expired - Fee Related," with adjusted expiration 2024-09-17.

Purpose: The invention relates generally to communications networks and, more particularly, to tracing back points of ingress of attacks in communications networks. The systems and methods "address this and other needs by providing mechanisms that can archive signatures of packets received at network nodes throughout a network."

Plain-Language Scope: Routers in a network compute signatures of received packets. Collection agents gather those signatures from connected routers, and a traceback manager requests them, based on attack reports from an intrusion detection system. Using known network topology, archived packet signatures are comparison-matched with signatures of an intruder packet to determine the packet's path through the network. The disclosed methods cover computing a packet signature in a router (computing a signature of the router's network address, zeroing selected packet fields, and computing the packet signature using the address signature) and archiving signatures at network nodes in a memory device.

Source: https://patents.google.com/patent/US7200105/en

What the excerpt does not establish: The supplied text is an excerpt; figures and flowcharts (FIGS. 1–14) are referenced but not reproduced, and claim text is absent. It does not confirm the exact counts of collection agents or intrusion detection systems, the full claim scope, or the legal effect of the listed assignments and status.