I have a PIX 525 that connects to a 6508 switch. The switch port is configured to auto and the PIX is 100 full. I trying to connect packet filter box in between. If I change the port configuration on the 6509 to 100 full, traffic drops. If I put it back to auto, traffic comes back. I read that it was not recommended to configure the PIX to auto. Any ideas why the traffic would drop?