Lab 5.3.8.2 – Configure Static NAT on a Cisco Router
Open Packet Tracer Activity 5.3.8.2 Use these instructions to complete the lab.
Be sure to answer all questions.
When done, click the Check Results button to verify your results,
and turn in this paper.
Objective
Configure the customer Cisco 1841 ISR to use NAT
Background / Preparation
In this Packet Tracer lab, you will continue the configuration of the Cisco 1841 ISR
router for the customer network by configuring NAT. The customer needs to provide
Internet access to one employee. Because the internal network has been configured
with a private address range, static NAT is needed to translate the internal computer
out through a public WAN IP address.
After you configure static NAT, you will verify the configuration using the customer
workstation by testing connectivity to the ISP server using the ping command.
Step 1:
Configure the static NAT
1. From the customer workstation, use a console cable and terminal emulation
software to connect to the console of the customer Cisco 1841 ISR.
2. Log in to the console of the customer Cisco 1841 ISR and enter the global
configuration mode.
3. Configure the FastEthernet 0/0 interface as the inside NAT interface using
these commands:
(config)#interface fastethernet 0/0
(config-if)#ip nat inside
(config-if)#exit
4. Configure the Serial 0/0/0 interface as the outside NAT interface using these
commands:
(config)#interface serial 0/0/0
(config-if)#ip nat outside
(config-if)#exit
5. Configure the static NAT mapping that maps the internal 192.168.1.10
address to the 209.165.200.227 external address using these commands:
(config)#ip nat inside source static 192.168.1.10 209.165.200.227
(config)#exit
6. Close the terminal emulation software on the customer workstation.
Step 2: Verifying the static NAT configuration
1. From the customer workstation, open the Command Prompt.
2. Type ping 209.165.201.10 to see if the customer workstation connects
to the customer DNS server.
Reflection
1. What is the purpose of static NAT?
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2. What command is used to designate the inside interface for static NAT?
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3. What IP address does the server respond to when the customer workstation
pings the Customer DNS server?
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