TAILIEUCHUNG - Lab 1.1.4a Configuring NAT

An ISP has allocated a company the public classless interdomain routing (CIDR) IP address . This is equivalent to 30 public IP addresses. Since the company has an internal requirement for more than 30 addresses, the IT manager has decided to implement NAT. The addresses – for static allocation and – for dynamic allocation. Routing will be done between the ISP and the gateway router used by the company. A static route will be used between the ISP and gateway router and a default route will be used between the gateway router and the ISP. The ISP connection to the Internet will. | Cisco SrsTEMS Lab Configuring NAT Router 1 Router 2 Router 2 DTE cisco Straight-through cable Serial cable Console rollover Crossover cable Router 1 class cisco class DCE 30 NA 30 32 Gateway 24 Router Router FastEthernet Interface Serial 0 Designation Name 0 Address type Address Subnet Mask Loopback 0 Enable Address Secret Subnet mask Password Enable VTY Console passwords Objective Configure a router to use network address translation NAT to convert internal IP addresses typically private addresses into outside public addresses. Background Preparation An ISP has allocated a company the public classless interdomain routing CIDR IP address 27. This is equivalent to 30 public IP addresses. Since the company has an internal requirement for more than 30 addresses the IT manager has decided to implement NAT. The addresses - for static allocation and - for dynamic allocation. Routing will be done between the ISP and the gateway router used by the company. A static route will be used between the ISP and gateway router and a default route will be used between the gateway router and the ISP. The ISP connection to the Internet will be represented by a loopback address on the ISP router. Cable a network similar to the one in the diagram above. Any router that meets the interface requirements displayed on the above diagram may be used. This includes the following and any of their possible combinations 800 series routers 1600 series routers 1 - 7 CCNA 4 WAN Technologies v - Lab Copyright 2003 Cisco Systems Inc. 1700 series routers 2500 series routers 2600 series routers Please refer to the chart at the end of the lab to correctly identify the interface identifiers to be used based on the equipment in the lab. The configuration output used in this lab is produced from 1721 series routers. Any other router used may produce slightly different output. Conduct the

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