Configuring DHCP. Equipment required for each group

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1 Configuring DHCP Objective Configure a router for Dynamic Host Configuration Protocol (DHCP) to dynamically assign addresses to attached hosts. Theory Dynamic Host Configuration Protocol (DHCP) is a protocol for assigning dynamic IP addresses to devices on a network. With dynamic addressing, a device can have a different IP address every time it connects to the network. In some systems, the device's IP address can even change while it is still connected. DHCP also supports a mix of static and dynamic IP addresses. Dynamic addressing simplifies network administration because the software keeps track of IP addresses rather than requiring an administrator to manage the task. This means that a new computer can be added to a network without the hassle of manually assigning it a unique IP address. Many ISPs use dynamic IP addressing for dial-up users. Features of DHCP DHCP supports the concept of a "lease" whereby a server can allocate an address to a client for a specific amount of time. If you have more devices than IP addresses, using shorter leases can help to keep you from running out of addresses. If you have more addresses than devices, you can utilize permanent leases or you can assign fixed addresses to specific device. Once the client has the lease, it must be renewed prior to the lease expiration through another DHCPREQUEST message. If a client finishes using a lease prior to its expiration date, the client is supposed to send a DHCPRELEASE message to the server so that the lease can be made available to other nodes. If the server doesn't hear from the client by the end of the lease, it marks the lease as non-renewed, and makes it available for other clients to use. During lease negotiation DHCP incorporates a much more robust dialogue when compared to other IP address allocation protocols such as BOOTP. Since the addresses can be assigned to the devices on an ad-hoc basis, mechanisms need to be incorporated into the assignment procedure that allow for a broader range of options, as well as for a broader range of error handling conditions. Background/Preparation Routing between the ISP and the campus router uses a static route between the ISP and the gateway router, and a default route between the gateway router and the ISP router. The ISP connection to the Internet is identified by a loopback address on the ISP router. Equipment required for each group If your class has 10 or less students you may work in pairs, otherwise work in groups of three. Two additional straight through network cables per group.

2 Two serial cables per group (for console connections). One DTE/smart serial cable and one DCE/smart serial cable per group. One Cisco switche per group. Two Cisco routers per group. Cable a network similar to the one in the diagram below. Please refer to the handout to correctly identify the interface identifiers to be used based on the equipment in the lab. The configuration output used in this exercise is produced from 1721 series Cisco routers. Any other router used may produce slightly different output. Conduct the following steps on each router unless specifically instructed otherwise. Note: Router 1 is directly connected to the switch and Router 2 is connected to Router 1. Router Designation Router Name FastEthernet 0 Address/sub net Mask Interface Type Serial 0 Address/Subne t Mask Router 1 Campus / DCE / Router 2 ISP NA DTE /3 0 Loopback 0 Address/Subnet Mask Enable Secret Password NA class cisco /32 class cisco Enable/VT Y/Console Passwords Procedure Start a HyperTerminal session. Reset the routers: Erasing and reloading the router Note: You must perform these steps on all routers in this lab exercise before continuing. Note: Please refer to the meaning and structure of the command syntax provided at the end of the exercise. Step 1: Enter into the global configuration mode (privileged EXEC mode) by typing the following:

3 Router> enable Step 2: At the privileged EXEC mode, enter the following command: Router# erase startup-config The responding prompt will be: Erasing the nvram filesystem will remove all files! Continue? [confirm] Press Enter to confirm The response should be: Erase of nvram: complete Step 3: Now at the privileged EXEC mode, enter the following command: Router# reload The responding prompt line will be: System configuration has been modified. Save? [yes/no]: n Proceed with reload? [confirm] Press Enter to confirm The Corresponding line prompt will be: Proceed with reload? [confirm] Press Enter to confirm. In the first line of the response will be: Reload requested by the console. After the router has reloaded, the line prompt will be: Would you like to enter the initial configuration dialog? [yes/no]: n If you are asked... Would you like to terminate autoinstall? [yes]: y The responding line prompt will be: Press Return to get started! Press Enter.

4 Now the router is ready for the assigned lab exercise to be performed. Step 1: Configure the routers. Configure the routers according to the chart in handout: The hostname. The console. The virtual terminal. The enable passwords. The interfaces. If problems occur during this configuration, refer to the handout s configuration reference information for help. Connect the network Connect the network cables. Power-up the switches. Reset the switches Step 2: Save the configuration. Enter into the global configuration mode by typing the following command: Router> enable At the privileged EXEC mode prompt, on both routers, type the command: Router# copy running-config startup-config Step 3: Configure the hosts with the proper IP address, subnet mask, and default gateway. Each workstation must be able to ping to the attached router. If for some reason this is not the case, troubleshoot as necessary. If running Windows 2000 or higher, check using ipconfig in the command prompt (DOS window). Step 4: Verify that the network is functioning. From the attached hosts, ping the FastEthernet interface of the default gateway router. Ping Was the ping from the first and the second host successful? If the answer is no then you may need to troubleshoot the router and host configurations to find the error. Then ping again until they both are successful. Step 5: Create a static route Create a static route from the ISP to the gateway router. Addresses /27 have been allocated for Internet access outside of the company. Use the following command to create the static route: In the global configuration mode, type the following command:

5 ISP# configuration t or conf t This changes the prompt to ISP(config)#. ISP(config)# ip route Step 6: Create a default route Add a default route from the gateway router to the ISP router. This will forward any unknown destination address traffic to the ISP. At the gateway router, enter into the global configuration mode by typing in the following command: Campus> enable At the global configuration mode (privileged EXEC mode), enter the following command: Campus# configuration t or conf t This changes the prompt to Gateway(config)#. Type in the following command: Campus(Config)# ip route Step 7: Create the DHCP address Pool To configure the campus LAN pool, use the following commands: campus(config)#ip dhcp pool campus campus(dhcp-config)#network campus(dhcp-config)#default-router campus(dhcp-config)#dns-server campus(dhcp-config)#domain-name foo.com campus(dhcp-config)#netbios-name-server Step 8: Excluding addresses from pool To exclude addresses from the pool, use the following command: Campus (dhcp-config)#ip dhcp excluded-address Step 8: Verifying DHCP Operation At each workstation on the directly connected subnet configure the TCP/IP properties so that the workstation will obtain an IP address and the Domain Name System (DNS) server address from the DHCP server. After changing and saving the configuration, reboot the workstation. If running Windows 2000, check using the command ipconfig in a DOS window to confirm TCP/IP configuration information. Observations

6 What IP address was assigned to the workstation? What other information was automatically assigned? When was the lease obtained? When will the lease expire? From the campus router, the bindings for the hosts can be seen. To see the bindings, use the following command at the privileged EXEC mode: ip dhcp binding Observations What were the IP addresses assigned? What were the other fields listed in the output? After the completion of the previous steps, finish the lab by doing the following: Logoff by typing exit. Turn the router off. Remove and store the cables and adapter.

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