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Topics: IP address, Subnetwork, Network address translation Pages: 6 (780 words) Published: March 17, 2014
Activity 7.4.2: Challenge DHCP and NAT Configuration
Topology Diagram

Addressing Table
Device
Interface
IP Address
Subnet Mask
R1
S0/0/0
172.16.0.1
255.255.255.252

Fa0/0
172.16.10.1
255.255.255.0

Fa0/1
172.16.11.1
255.255.255.0
R2
S0/0/0
172.16.0.2
255.255.255.252

S0/0/1
209.165.201.1
255.255.255.252

Fa0/0
172.16.20.1
255.255.255.0
ISP
S0/0/1
209.165.201.2
255.255.255.252
Learning Objectives
Upon completion of this lab, you will be able to:
Prepare the network
Perform basic router configurations
Configure a Cisco IOS DHCP server
Configure static and default routing
Configure static NAT
Configure dynamic NAT with a pool of addresses
Configure NAT overload
Scenario
In this lab, configure the IP address services using the network shown in the topology diagram. If you need assistance, refer back to the basic DHCP and NAT configuration lab. However, try to do as much on your own as possible. Task 1: Perform Basic Router Configurations

Configure the R1, R2, and ISP routers according to the following guidelines: Configure the device hostname.
Disable DNS lookup.
Configure a privileged EXEC mode password.
Configure a message-of-the-day banner.
Configure a password for the console connections.
Configure a password for all vty connections.
Configure IP addresses on all routers. The PCs receive IP addressing from DHCP later in the lab. Enable RIPv2 on R1 and R2. Do not advertise the 209.165.200.224/27 network. For all devices:
enable
conf t
no ip domain-lookup
enable secret class
banner motd $Authorized Access Only!$
!
line con 0
logging synchronous
password cisco
login
!
line vty 0 4
password cisco
login
end
copy run start

R1:
hostname R1
int fa0/0
ip address 172.16.10.1 255.255.255.0
no shut
int fa0/1
ip address 172.16.11.1 255.255.255.0
no shut
int s0/0/0
ip address 172.16.0.1 255.255.255.252
clock rate 125000
no shut
!
router rip
version 2
network 172.16.0.0
no auto-summary

R2:
hostname R2
int fa0/0
ip address 172.16.20.1 255.255.255.0
no shut
int s0/0/0
ip address 172.16.0.2 255.255.255.252
no shut
int s0/0/1
ip address 209.165.201.1 255.255.255.252
clock rate 125000
no shut
!
router rip
version 2
network 172.16.0.0
no auto-summary

ISP:
hostname ISP
int s0/0/1
ip address 209.165.201.2 255.255.255.252
no shut
!
Task 2: Configure a Cisco IOS DHCP Server
Configure R1 as the DHCP server for the two directly attached LANs. Step 1. Exclude statically assigned addresses.
Exclude the first three addresses from each pool.
R1(config)#ip dhcp excluded-address 172.16.10.1 172.16.10.3
R1(config)#ip dhcp excluded-address 172.16.11.1 172.16.11.3
Step 2. Configure the DHCP pool.
Create two DHCP pools. Name one of them R1_LAN10 for the 172.16.10.0/24 network, and name the other R1_LAN11 for the 172.16.11.0/24 network. Configure each pool with a default gateway and a simulated DNS at 172.16.20.254. R1(config)#ip dhcp pool R1_LAN10

R1(dhcp-config)#network 172.16.10.0 255.255.255.0
R1(dhcp-config)#default-router 172.16.10.1
R1(dhcp-config)#dns-server 172.16.20.254
R1(dhcp-config)#ip dhcp pool R1_LAN11
R1(dhcp-config)#network 172.16.11.0 255.255.255.0
R1(dhcp-config)#default-router 172.16.11.1
R1(dhcp-config)#dns-server 172.16.20.254
Step 3. Verify the DHCP configuration.
R1#show ip dhcp binding
IP address Client-ID/ Lease expiration Type Hardware address
172.16.10.4 00E0.F70C.7E1E -- Automatic 172.16.11.4 0009.7CB0.39E6 -- Automatic Task 3: Configure Static and Default Routing
Configure ISP with a static route for the 209.165.201.0/27 network. Use the exit interface as an argument. ISP(config)#ip route 209.165.201.0 255.255.255.224 serial 0/0/1 Configure a default route on R2 and propagate the route in OSPF. Use the next-hop IP address as an argument. R2(config)#ip route...
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