Reading more carefully, the best option is to just take the router out of the picture. It was needed to provide connectivity between the PIX's ethernet and the T1's serial, but won't be with Comcast.
I would just assign the Comcast IP address and default gateway to the PIX's outside interface and plug that directly into the cable bridge, bypassing the router entirely.
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by: jodylemoinePosted on 2009-09-30 at 09:17:57ID: 25460435
You're going to have to use the FastEthernet0/1 connection for a cable line. T1 connections are serial (hence the use of the serial port) but a cable connection is going to give you an ethernet connection from the cable bridge.