CISCO. Cisco Networking Academy® Lab - Configuring Dynamic and Static NAT Topology PC-A Simulated Server F0/6 S1 F0/5 G0/1 S0/0/1 Mind Wide Open“ Simulated Internet Services Lo0 S0/0/0 Gateway DCE F0/18 PC-B Addressing Table Device Interface IP Address Gateway ISP G0/1 S0/0/1 S0/0/0 (DCE) Lo0 192.168.1.1 209.165.201.18 209.165.201.17 192.31.7.1 PC-A (Simulated Server) NIC 192.168.1.20 PC-B NIC 192.168.1.21 Objectives Part 1: Build the Network and Verify Connectivity Part 2: Configure and Verify Static NAT Part 3: Configure and Verify Dynamic NAT Subnet Mask 255.255.255.0 255.255.255.252 255.255.255.252 255.255.255.255 N/A 255.255.255.0 255.255.255.0 ISP Default Gateway N/A N/A N/A 192.168.1.1 192.168.1.1 Background / Scenario Network Address Translation (NAT) is the process where a network device, such as a Cisco router, assigns a public address to host devices inside a private network. The main reason to use NAT is to reduce the number of public IP addresses that an organization uses because the number of available IPv4 public addresses is limited. In this lab, an ISP has allocated the public IP address space of 209.165.200.224/27 to a company. This provides the company with 30 public IP addresses. The addresses, 209.165.200.225 to 209.165.200.241, are @ 2022 Cisco and/or its affiliates. All rights reserved. This document is Cisco Public. Page 1 of 9
Lab - Configuring Dynamic and Static NAT for static allocation and 209.165.200.242 to 209.165.200.254 are for dynamic allocation. A static route is used from the ISP to the gateway router, and a default route is used from the gateway to the ISP router. The ISP connection to the Internet is simulated by a loopback address on the ISP router. Note: The routers used with CCNA hands-on labs are Cisco 1941 Integrated Services Routers (ISRs) with Cisco IOS Release 15.2(4)M3 (universalk9 image). The switches used are Cisco Catalyst 2960s with Cisco IOS Release 15.0(2) (lanbasek9 image). Other routers, switches and Cisco IOS versions can be used. Depending on the model and Cisco IOS version, the commands available and output produced might vary from what is shown in the labs. Refer to the Router Interface Summary Table at the end of this lab for the correct interface identifiers. Note: Make sure that the routers and switch have been erased and have no startup configurations. If you are unsure, contact your instructor. Required Resources · 2 Routers (Cisco 1941 with Cisco IOS Release 15.2(4)M3 universal image or comparable) · 1 Switch (Cisco 2960 with Cisco IOS Release 15.0(2) lanbasek9 image or comparable) . 2 PCs (Windows 7, Vista, or XP with terminal emulation program, such as Tera Term) · Console cables to configure the Cisco IOS devices via the console ports . Ethernet and serial cables as shown in the topology Part 1: Build the Network and Verify Connectivity In Part 1, you will set up the network topology and configure basic settings, such as the interface IP addresses, static routing, device access, and passwords. Step 1: Cable the network as shown in the topology. Attach the devices as shown in the topology diagram, and cable as