DHCP COMMANDS IN COMPUTER NETWORKING
What is DHCP?Dynamic Host Configuration Protocol
DEFINITION
Dynamic Host Configuration Protocol (DHCP) is a network management protocol used to automate the process of configuring devices on IP networks, thus allowing them to use network services such as DNS, NTP, and any communication protocol based on UDP or TCP. A DHCP server dynamically assigns an IP address and other network configuration parameters to each device on a network so they can communicate with other IP networks. DHCP is an enhancement of an older protocol called BOOTP. DHCP is an important part of the DDI Solution (DNS-DHCP-IPAM).
DHCP server CLI commands
| Command options | Description |
|---|---|
| domain-name | Specifies the domain name for the DHCP clients. |
| domain-name-servers | Specifies the Domain Name System (DNS) IP servers that are available to the DHCP clients. |
| merit-dump | Specifies the path name of a file into which the client’s core image should be placed in the event that the client crashes (the DHCP application issues an exception in case of errors such as division by zero). |
| root-path | Specifies the name of the path that contains the client’s root filesystem in NFS notation. |
| router | Adds the default router and gateway for the DHCP clients. |
| subnet-mask | Defines the subnet mask for the network. |
| broadcast-address | Defines a broadcast address for the network. |
| wins-server | Defines the NetBIOS Windows Internet Naming Service (WINS) name servers that are available to Microsoft DHCP clients. |
| log-servers | Defines a list of log servers available to the client. |
| bootstrap-server | Specifies the IP address of the bootstrap server (the command fills the “siaddr” field in the DHCP packet). |
| Command | Description |
|---|---|
| dbexpire command | Specifies how long, in seconds, the DHCP server should wait before aborting a database transfer. |
| ip dhcp-server arp-ping-timeout | Specifies the time (in seconds) the server will wait for a response to an arp-ping packet before deleting the client from the binding database. The minimum setting is 5 seconds and the maximum time is 30 seconds.NOTEDo not alter the default value unless it is necessary. Increasing the value of this timer may increase the time to get console access after a reboot. |
| clear ip dhcp-server binding | Deletes a specific, or all leases from the binding database. |
| ip dhcp-server enable | Enables the DHCP server feature. |
| no ip dhcp-server mgmt | Disables DHCP server on the management port. |
| ip dhcp-server pool | Switches to pool configuration mode (config-dhcp-name# prompt) and creates an address pool. |
| ip dhcp-server relay-agent-echo enable | Enables relay agent echo (Option 82). |
| ip dhcp-server | Specifies the IP address of the selected DHCP server. |
| show ip dhcp-server binding | Displays a specific lease entry, or all lease entries. |
| show ip dhcp-server | Displays a specific address pool or all address pools. |
| show ip dhcp-server flash | Displays the lease binding database that is stored in flash memory. |
| show ip dhcp-server summary | Displays a summary of active leases, deployed address pools, undeployed address pools, and server uptime. |
| bootfile | Specifies a boot image to be used by the client. |
| deploy | Deploys an address pool configuration to the server. |
| dhcp-default-router | Specifies the IP address of the default router or routers for a client. |
| dns-server | Specifies the IP addresses of a DNS server or servers available to the client. |
| domain-name | Configures the domain name for the client. |
| lease | Specifies the lease duration for an address pool. The default is a one-day lease. |
| excluded-address | Specifies an address or range of addresses to be excluded from the address pool. |
| netbios-name-server | Specifies the IP address of a NetBIOS WINS server or servers that are available to Microsoft DHCP clients. |
| network | Configures the subnet network and mask of the DHCP address pool. |
| next-bootstrap-server | Configures the IP address of the next server to be used for startup by the client. |
| tftp-server | Configures the address or name of the TFTP server available to the client. |
| vendor-class | Specifies the vendor type and configuration value for the DHCP client. |
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