Troubleshooting guide

Cisco DSL Router Configuration and Troubleshooting
Guide
RFC1483 Bridging with IRB Implementation Options
Select one of the following RFC1483 Bridging with integrated routing and bridging (IRB) implementation
options for your Asymmetric Digital Subscriber Line (ADSL) service. Both implementation options include
configuration examples for Network Address Translation (NAT) overload, NAT Pool, Static NAT, and
Dynamic Host Control Protocol (DHCP) Server.
RFC1483 IRB Option 1 – Your ISP is assigning a single dynamic public IP address to your Cisco DSL
Router.
RFC1483 IRB Option 2 – Your ISP is assigning a single static public IP address to your Cisco DSL Router.
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Cisco DSL Router Configuration and Troubleshooting
Guide
IRB with a Static IP Address
Your Internet Service Provider (ISP) has assigned a static public IP address to your Cisco DSL Router.
Tip: If you are not familiar with configuring Cisco devices and would like to follow a step−by−step
configuration, click here.
Tasks to Perform
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: Required Configuration, Dynamic Host Configuration
Protocol (DHCP) Server, Network Address Translation (NAT) overload.
Design an IP addressing scheme for your private LAN.•
Configure an IP address and subnet mask on the Cisco DSL Router Ethernet interface.•
Configure the ATM interface (Asymmetric Digital Subscriber Line (ADSL) interface) of the Cisco
DSL Router with an ATM permanent virtual circuit (PVC) and encapsulation.
•
Enable integrated routing and bridging (IRB).•
Cisco DSL Router Configuration and Troubleshooting Guide