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Stateful Packet Inspection: 

In response to Ddos (Distributed Denial Of Service) attacks, some Consumer Routers are starting to employ Stateful Packet Inspection. Expect to pay more for these Routers.

A firewall technology monitoring the state of the transaction to verify the destination of an inbound packet matches the source of a previous outbound request.

1. www.eWeek.com - Reactive Offers Free Anti-DoS Tool (4/16/2003).

   1. www.reactivenetwork.com

2. Webopedia.com Definition: Firewall Function a.k.a. Dynamic Packet Filtering - Firewall architecture working @ network layer.
   

3. CheckPoint.com: Stateful Inspection Technology -
   
4. ZDNet Has Security Reached Uncharted Waters?