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Lab - Troubleshooting NAT Configurations (Instructor Version)
Instructor Note: Red font color or Gray highlights indicate text that appears in the instructor copy only.
Topology
Addressing Table
Device
Interface
IP Address
Subnet Mask
Default Gateway
Gateway
G0/1
192.168.1.1
255.255.255.0
N/A
S0/0/1
209.165.200.225
255.255.255.252
N/A
ISP
S0/0/0 (DCE)
209.165.200.226
255.255.255.252
N/A
Lo0
198.133.219.1
255.255.255.255
N/A
PC-A
NIC
192.168.1.3
255.255.255.0
192.168.1.1
PC-B
NIC
192.168.1.4
255.255.255.0
192.168.1.1
Objectives
Part 1: Build the Network and Configure Basic Device Settings
Part 2: Troubleshoot Static NAT
Part 3: Troubleshoot Dynamic NAT
Background / Scenario
In this lab, the Gateway router was configured by an inexperienced network administrator at your company.
Several errors in the configuration have resulted in NAT issues. Your boss has asked you to troubleshoot and
correct the NAT errors and document your work. Ensure that the network supports the following:
 PC-A acts as a web server with a static NAT and will be reachable from the outside using the
209.165.200.254 address.