Business customers sometimes state that they need DSL/Broadband CPE that can be configured or placed into a Bridged Mode where they are putting other CPE behind the DSL/Broadband CPE. Many times these customers can be better served with a configuration known as IP Passthrough.
Use Configuring IP Passthrough PDF to understand the difference between IP Passthrough vs Bridged mode and to get instructions on how to configure the Motorola NVG510 gateway and Motorola 2210/2310 modems for IP Passthrough.