Troubleshooting guide

address)?
Record Information About Your Network
Record the following information about your private network. This information is not related to the ISP.
Are you performing Network Address
Translation (NAT) on your private
network?
Yes No
Are you configuring the Cisco DSL
Router to act as a Dynamic Host Control
Protocol (DHCP) server?
Yes No
What IP address and subnet mask will you
configure on the Ethernet0 interface?
IP Address
Subnet Mask
Choose Your Next Step
When you have all the information you need from your ISP and about your private network, select one of the
following based on whether you have a new installation or are troubleshooting an existing one.
New DSL configuration
Troubleshooting my existing DSL connection
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Cisco DSL Router Configuration and Troubleshooting
Guide
Step−by−Step Configuration of IRB with a Dynamic IP
Address
Your Internet Service Provider (ISP) has assigned a dynamic public IP address to your Cisco Digital Subsriber
Line (DSL) Router.
Note: A color code is used to relate tasks in this section with examples of configurations in the Configuration
section. Configurations are color−coded as follows: Dynamic Host Configuration Protocol (DHCP) Server,
Network Address Translation (NAT).
Step−by−Step Configuration
Important: Before you begin, close all programs on the PC that might be monitoring your COM port.
Devices such as PDAs and digital cameras often place programs in the system tray that will render your COM
port unusable for configuring your Cisco DSL Router.
Cisco DSL Router Configuration and Troubleshooting Guide