Some consumer-focused routers have for some time claimed to use Stateful Packet Inspection (SPI) in their firewalls. But the recent generation of boxes based on the ADMtek 5106 Home Gateway Controller, (which was purchased by Conexant and is now the Conexant CX84200 Network Processor) seem to really be using SPI, or at least, doing something differently than their previously-released brethren. The telltale signs of this new generation of routers seem to be a significant reduction in measured throughput when the LAN test client is put in the router's DMZ, and problems in completing UDP streaming tests under normal Qcheck test conditions.