the configuration of dhcp and nat in cisco packet tracer

1. Three CCNA Labs In One DHCP NAT Troubleshooting
Posted by Barry on December 5th, 2012
The Cisco Packet Tracer activities contained in this lab cover two technologies that I feel go hand-in-hand, DHCP
and NAT. This along with the troubleshooting lab will provide CCNA students a better understanding of DHCP
and NAT.
These labs have been created using Packet Tracer which is an excellent routing and switching simulator for
students studying for their CCNA exam.
DHCP:
DHCP assigns IP addresses and other important network configuration information dynamically. Cisco routers
can use the Cisco IOS feature set, Easy IP, as an optional, full-featured DHCP server. Easy IP leases
configurations for 24 hours by default. In this activity, you will configure DHCP services on two routers and test
your configuration. The user EXEC password is cisco, and the privileged EXEC password is class.
NAT:
NAT translates non-routable private, internal addresses into routable, public addresses. NAT has an added benefit
of providing a degree of privacy and security to a network because it hides internal IP addresses from outside
networks. In this activity, you will configure dynamic and static NAT. The user EXEC password is cisco, and the
privileged EXEC password is class.
Troubleshooting:
The routers, R1 and R2, at your company were configured by an inexperienced network engineer. Several errors
in the configuration have resulted in connectivity issues. Your boss has asked you to troubleshoot and correct the
configuration errors and document your work. Using your knowledge of DHCP, NAT, and standard testing
methods, find and correct the errors. Make sure all clients have full connectivity. The ISP has been configured
correctly. Ensure that the network supports the following:
1. The router R2 should serve as the DHCP server for the 172.16.10.0/24 and 172.16.11.0/24 networks
connected to R1.
2. All PCs connected to R1 should receive an IP address in the correct network via DHCP.
3. Traffic from the R1 LANs entering the Serial 0/0/0 interface on R2 and exiting the Serial 0/0/1 interface
on R2 should receive NAT translation with a pool of addresses provided by the ISP.

2. 4. The inside server should be reachable from outside networks using IP address 209.165.201.30, and to
inside networks using IP address 172.16.20.254.
Learning Objectives:
Upon completion of these labs, you will be able to:
 Configure routers with Easy IP.
 Verify that PCs are dynamically configured with addressing details.
 Configure a DNS server with DNS entries.
 Configure an ACL to permit NAT.
 Configure static NAT.
 Configure dynamic NAT Overload.
 Configure the ISP router with static route.
 Test PC connectivity to domain names.
 Prepare the network
 Load routers with scripts
 Find and correct network errors
 Document the corrected network