Troubleshooting guide
!−−− for this example. You can open other TCP or UDP ports, if needed.
!
ip classless
ip route 0.0.0.0 0.0.0.0 <default gateway to isp>
access−list 1 permit <ip network address of ethernet0> <wildcard mask>
!−−− In this configuration, access−list 1 defines a standard access list
!−−− permitting the addresses that NAT will translate. For example, if
!−−− your private IP network was 10.10.10.0, configuring
!−−− access−list 1 permit 10.10.10.0 0.0.0.255 would allow NAT to translate
!−−− packets with source addresses between 10.10.10.0 and 10.10.10.255.
!
end
Troubleshoot Your Configuration
If your ADSL service is not working properly, see Troubleshooting RFC1483 Routing.
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Cisco DSL Router Configuration and Troubleshooting
Guide
RFC1483 Routing with a Block of Static IP Addresses
Your Internet Service Provider (ISP) has assigned a block of public IP addresses to your LAN, but you were
not assigned a single public IP address for the ATM interface on the Cisco Digital Subscriber Line (DSL)
Router. To enable all your internal users to access the Internet using this block of IP addresses, you must
follow the tasks outlined below.
Tip: If you aren't 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: Dynamic Host Configuration Protocol (DHCP) Server.
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.
•
Configure each host PC with an IP address, subnet mask, default gateway, and Domain Name System
(DNS) server(s).
•
Cisco DSL Router Configuration and Troubleshooting Guide