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  Configuration Example
For complete information on the NAT commands, see the Cisco IOS Release 12.3 documentation set. 
For more general information on NAT concepts, see 
Appendix B, “Concepts.”
Configuration Example
The following configuration example shows a portion of the configuration file for the PPPoE scenario 
described in this chapter.
The VLAN...

 
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  Configuration Example
Verifying Your Configuration
Use the show ip nat statistics command in privileged EXEC mode to verify NAT configuration. You 
should see verification output similar to the following example:
Router# show ip nat statistics 
Total active translations: 0 (0 static, 0 dynamic; 0 extended)
Outside interfaces:  FastEthernet4
Inside...

CH A P T E R
 
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Configuring PPP over ATM with NAT
The Cisco 1801, Cisco 1802, and Cisco 1803 access routers support Point-to-Point Protocol over 
Asynchronous Transfer Mode (PPPoA) client s and network address translation (NAT). 
Multiple PCs can be connected to the LAN behind the router. Before traffic from the PCs is sent to the 
PPPoA session, it can be encrypted, filtered, and so...

 
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Chapter 4      Configuring PPP over ATM with NAT
  
In this scenario, the small business or remote user on the Fast Ethernet LAN can connect to an Internet 
Service Provider (ISP) using the following protocols on the WAN connection:
 Asymmetric digital subscriber line (ADSL) over plain old telephone service (POTS) using the 
Cisco
 1801 router
 ADSL over integrated services digital network (ISDN) using...

 
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Chapter 4      Configuring PPP over ATM with NAT
  Configure the Dialer Interface
Configure the Dialer Interface
The dialer interface indicates how to handle traffic from the clients, including, for example, default 
routing information, the encapsulation protocol, and the dialer pool to use. It is also used for cloning 
virtual access. Multiple PPPoA client sessions can be configured on an ATM interface,...

 
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  Configure the Dialer Interface
Repeat these steps for any additional dialer interfaces or dialer pools needed.
Step 7dialer-group group-number
Example:
Router(config-if)# dialer-group 1Router(config-if)# 
Assigns the dialer interface to a dialer group 
(1–10).
TipUsing a dialer group controls access to 
your router.
Step 8exit
Example:
Router(config-if)#...

 
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  Configure the ATM WAN Interface
Configure the ATM WAN Interface
Perform these steps to configure the ATM interface, beginning in global configuration mode.
CommandPurpose
Step 1interface type number
Example:
Router(config)# interface atm 0Router(config-if)# 
Enters interface configuration mode for the ATM 
interface (labeled ADSLoPOTS or G.SHDSL on 
the...

 
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  Configure DSL Signaling Protocol
Configure DSL Signaling Protocol
DSL signaling must be configured on the ATM interface for connection to your ISP. The Cisco 1801 
supports ADSL signaling over POTS, the Cisco
 1802 supports ADSL signaling over ISDN, and the 
Cisco 1803 supports SHDSL signaling.
Based on the router you are configuring, see one of the...

 
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  Configure DSL Signaling Protocol
If you wish to change any of these settings, use one of the following commands in global configuration 
mode.
 dsl operating-mode (from the ATM interface configuration mode)
 dsl lom integer
 dsl enable-training-log
See the Cisco IOS Wide-Area Networking Command Reference for details of these commands.
Verify the...

 
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  Configure DSL Signaling Protocol
NoteIf you are integrating your Cisco router into a European network, please use one of the following 
commands:
 
 
For CO mode, use the dsl dsl-mode shdsl symmetric annex {A | B | B-ANFP} command to choose 
annex B or B-ANFP. 
 
 
For CPE mode, use the dsl dsl-mode shdsl symmetric annex {A | A-B | A-B-ANFP | B | B-ANFP}...