US 6,983,323 B2
Multi-level packet screening with dynamically selected filtering criteria
Craig Cantrell, Austin, Tex. (US); Marc Willebeek-LeMair, Austin, Tex. (US); Dennis Cox, Austin, Tex. (US); Donovan Kolbly, Austin, Tex. (US); and Brian Smith, Fort Worth, Tex. (US)
Assigned to TippingPoint Technologies, Inc., Austin, Tex. (US)
Filed on Aug. 12, 2002, as Appl. No. 10/217,862.
Prior Publication US 2004/0030776 A1, Feb. 12, 2004
Int. Cl. G06F 13/00 (2006.01)
U.S. Cl. 709—225 75 Claims
OG exemplary drawing
 
1. A packet filtering device, comprising:
a first filter applying a first filtering criteria against packet traffic to generate a first pass traffic portion and a fail traffic portion; and
a second filter, by-passed by the first pass traffic portion, applying a second filtering criteria against the fail traffic portion to generate a second pass traffic portion and a reject traffic portion;
wherein the first and second filtering criteria are dynamically selected during first and second filter operation to filter packet traffic.