You are also required to configure the edge router as a DHCP client so that it receives an IP address from the ISP network. As the network technician for your company, you are tasked with configuring a Cisco router as a DHCP server to provide dynamic allocation of addresses to clients on the network. However, a Cisco router can be configured to provide DHCP services without the need for a dedicated server. Part 4: Verify DHCP and Connectivity ScenarioĪ dedicated DHCP server is scalable and relatively easy to manage, but can be costly to have one at every location in a network. Part 3: Configure a Router as a DHCP Client Part 1: Configure a Router as a DHCP Server The figure below illustrates the output of this command.8.1.3.3 Packet Tracer – Configuring DHCPv4 Using Cisco IOS Addressing Table Device We can also use the | pipe to display only the parameter associated with DHCPv4 configuration for example show running-config | begin dhcp. We can use the show running-config command to displays the DHCPv4 configuration. We can verify the DHCPv4 configuration using different commands. The DHCPv4 is configured to provide services of DHCPv4 to corresponding LAN. In the above example, we have configured the DHCPv4 server on Router0. To re-enable the service use the service dhcp command in global configuration mode. To disable the service, use the no service dhcp command in global configuration mode. The DHCPv4 service is by default enabled on most of Cisco IOS, if someone needs to disable the DHCP service. Router(dhcp-config)#netbios-name-server DHCPv4 ExampleĪ sample configuration with basic DHCPv4 parameters configured on router Router0, a DHCPv4 server for the 192.168.1.0/24 LAN is shown in the Figure below. The commands for these optional parameters are following: The DNS server, domain name, DHCP lease duration and NetBIOS Wins server configuration are optional for DHCPv4. Usually, one gateway is required for a network, but we can also configure multiple gateways. Typically, the gateway is the LAN interface of the router closest to the client devices. Using the above command we configure the default router or default gateway for the network. The next compulsory command is defaulter-router. This command will attach the IP address pool to the DHCPv4 pool created earlier. The command for these parameters are the following: The DNS server, domain name, DHCP lease duration and NetBIOS Wins server configuration are optional. The address pool and default gateway router must be configured. Some of these parameters are optional, while others must be configured. Configuring other network ParametersĪfter creating a DHCPv4 pool and enter into the DHCPv4 mode, we configure several parameters. The prompt of the DHCPv4 mode is Router(dhcp-config)#. The ip dhcp pool will also put the router into configuration mode. The command for creating a DHCPv4 pool is ip dhcp pool. Creating a DHCPv4 PoolĪfter Excluding IP addresses create and define an IPv4 addresses pool to assign. The addresses assigned to the router must be excluded including the servers, printers, and other devices that have been manually configured. We can exclude a single address or a range of addresses using the first address and last address of the range. To exclude particular addresses from being assigned by DHCPv4, use the following command. So, these addresses should be excluded from being assigned by the DHCPv4 server. Typically, some IPv4 addresses in a pool are assigned to network devices manually. The router configured as the DHCPv4 server assigns all IPv4 addresses in an address pool unless configured to exclude specific addresses. The steps for configuring DHCPv4 server on Cisco routers are the following: Excluding IPv4 Addresses The DHCPv4 server assigns and manages IPv4 addresses from specified address pools within the router to DHCPv4 clients. A Cisco router can be configured as a DHCPv4 server.
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