The initial configuration of a Riverbed AppResponse appliance is performed using the Command-Line Interface (CLI). This first-time setup requires a direct connection to the appliance's serial console port. Through the CLI, an administrator sets fundamental network parameters, such as the IP address, subnet mask, default gateway, and DNS servers for the primary management interface. Once this essential network connectivity is established via the CLI, all subsequent, more detailed configuration and daily management tasks are performed using the Web-based User Interface (Web UI).

B. Desktop App: Riverbed does not utilize a specific desktop application for the initial setup of its AppResponse appliances; configuration is done via standard interfaces like CLI and Web UI.

C. Packet Analyzer: The Packet Analyzer is a feature within the AppResponse software used for network traffic analysis, not a tool for configuring the appliance's system settings.

D. Web UI: The Web UI is the primary interface for ongoing management, but it is only accessible after the appliance has been assigned an IP address during the initial setup via the CLI.

1. Riverbed AppResponse 11 Installation and Configuration Guide, Version 11.12, Page 13, Chapter 2, "Initial Configuration". The document states, "You use the command-line interface (CLI) to perform the initial configuration of the appliance. During initial configuration, you will set the IP address, netmask, and default gateway for the primary interface."

2. Riverbed AppResponse 11 CLI User's Guide, Version 11.12, Page 11, Chapter 2, "Getting Started with the CLI". This guide details the configure command, which is the primary tool used for the initial setup process. It states, "The configure command starts a configuration wizard that prompts you for basic system settings."