Troubleshooting guide

!−−− ip nat inside source list 1 interface bvi1 overload

!−−− with the following two configuration statements:

!−−− ip nat inside source list 1 pool <nat pool name> overload

!−−− ip nat pool <nat pool name> <first ip address> <last ip address>

!−−− netmask <subnet mask>

!−−− If Internet users require access to an internal server, you can

!−−− add the following static NAT configuration statement:

!−−− ip nat inside source static tcp <inside ip address of server> {80 or 25}

!−−− <outside well−known ip address of server> {80 or 25} extendable

!−−− Note: TCP port 80 (HTTP/web) and TCP port 25 (SMTP/mail) are used

!−−− 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.

bridge 1 protocol ieee

bridge 1 route ip

end

Troubleshoot Your Configuration

If your ADSL service is not working properly, see Troubleshooting RFC1483 Bridging with IRB.

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Cisco DSL Router Configuration and Troubleshooting

Guide

IRB with a Dynamic IP Address

Your Internet Service Provider (ISP) has assigned a dynamic public IP address to your Cisco Digital

Subscriber Line (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: Dynamic Host Configuration Protocol (DHCP) Server,

Cisco DSL Router Configuration and Troubleshooting Guide