CertExams.com Simulator Lab Exercises Answers

NAT and PAT

Description : This lab exercise demonstrates configuring all three types of  NAT namely Static NAT, Dynamic NAT and Overloading (Port Address Translation).


IP Address Assignment Table

Device Interface IP Address Mask
R1 E0
S0

192.168.1.1
192.168.100.1

255.255.255.0
255.255.255.0
R2 E0 192.168.1.2 255.255.255.0
R3 S0
S1
192.168.100.2
192.168.200.1
255.255.255.0
255.255.255.0
R4 S0 192.168.200.2 255.255.255.0


Instructions:

1. On R1, configure NAT to statically translate R2ís 192.168.1.2 Ethernet address to 200.200.200.2

2. Telnet from R2 to R3 to test the static NAT translation

3. Issue show users command on R3 which should show that the device with 200.200.200.2 (Translated IP Address) is the logged in device.

4. Issue show ip nat translations command on R1 to display the NAT Translation table. The response of this command should show that the inside local IP Address (192.168.1.2) is translated to to inside global IP Address (200.200.200.2)

5. On R1, remove the previously configured static NAT commands and configure NAT to translate R2ís Ethernet address to a dynamically assigned address. For this, utilize a pool of public addresses in the range of 200.200.200.50 to 200.200.200.100

6. Telnet from R2 to R3 to test the dynamic NAT translation

7. Issue show users command on R3 which should show that the device with 200.200.200.50 (Translated Address) is the logged in device

8. Issue show ip nat translations command on R1 to display the NAT Translation table

9. On R1, remove the previous NAT commands and configure NAT Overloading (Port Address Translation) on R1 to translate R2ís Ethernet address (192.168.1.2) to Serial 0 interface address (192.168.100.1)

10. Telnet from R2 to R3 to test the PAT function

11. Issue show users command on R3 which should show that the device with 192.168.100.1 (Translated Address) is the logged in device

12. Issue show ip nat translations command on R1 to display the NAT translation table 

Note: Please refer to the CertExams.com Network Simulator software for complete lab with commands. 

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