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Cisco Systems 32369 ip dhcp ping packets count no ip dhcp ping packets, Syntax Description

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ip dhcp ping packets

ip dhcp ping packets

To specify the number of packets a Cisco IOS Dynamic Host Configuration Protocol (DHCP) Server sends to a pool address as part of a ping operation, use the ip dhcp ping packets global conﬁguration command. Use the no form of this command to prevent the server from pinging pool addresses.

ip dhcp ping packets count

no ip dhcp ping packets

Syntax Description

count	Indicates the number of ping packets that are sent before assigning the
	address to a requesting client. The default value is two packets.

Defaults

Two packets

Command Modes

Global conﬁguration

Usage Guidelines

This command ﬁrst appeared in Cisco IOS Release 12.0(1)T.

The DHCP server pings a pool address before assigning the address to a requesting client. If the ping is unanswered, the DHCP server assumes (with a high probability) that the address is not in use and assigns the address to the requesting client.

Examples

The following example speciﬁes ﬁve ping attempts by the DHCP server before ceasing any further ping attempts:

ip dhcp ping packets 5

Related Commands

clear ip dhcp conﬂicts ip dhcp ping timeout show ip dhcp conﬂicts

Cisco IOS DHCP Server 29

Image 29

Cisco Systems 32369 ip dhcp ping packets count no ip dhcp ping packets, Syntax Description, Defaults, Command Modes

Contents

Cisco IOS DHCP Server Feature OverviewSupported Platforms BeneﬁtsRFC 1542, Clariﬁcations and Extensions for the Bootstrap Protocol RFC 951, Bootstrap Protocol BOOTPRFC 2132, DHCP Options and BOOTP Vendor Extensions Supported Standards, MIBs, and RFCsDHCP Conﬁguration Task List PrerequisitesExcluding IP Addresses Conﬁguring a DHCP Database Agent or Disabling DHCP Conﬂict LoggingConﬁguring a DHCP Address Pool timeout seconds write-delay secondsConﬁguring the Domain Name for the Client Conﬁguring the DHCP Address Pool Subnet and MaskConﬁguring the Domain Name System IP Servers for the Client 6 Release 12.01TConﬁguring the Default Router for the Client Conﬁguring the NetBIOS Node Type for the ClientConﬁguring Manual Bindings Conﬁguring the Address Lease Time8 Release 12.01T Configuring a DHCP Server Boot FileConﬁguring the Number of Ping Packets Monitoring and Maintaining the DHCP Server Conﬁguring the Timeout Value for Ping PacketsEnabling the Cisco IOS DHCP Server Feature DHCP Address Pool Conﬁguration Example Conﬁguration ExamplesDHCP Database Agent Conﬁguration Example Manual Bindings Configuration Example Manual Bindings Conﬁguration Examplebootﬁle clear ip dhcp binding clear ip dhcp conﬂict Command Referencedefault-router dns-server domain-name hardware-address host ip dhcp ping packets ip dhcp ping timeout ip dhcp poolshow atm vc begin PeakRate command begin include exclude regular-expressionDefaults bootﬁleCommand Modes Related Commandsclear ip dhcp binding address clear ip dhcp bindingaddress Clears all automatic bindingsclear ip dhcp conﬂict address clear ip dhcp conﬂictwant to clear Clears all address conﬂictsclear ip dhcp server statistics clear ip dhcp server statisticsCommand Modes Related Commandsclient-identiﬁer unique-identiﬁer no client-identiﬁer client-identiﬁerunique-identiﬁer hardware-address host ip dhcp poolclient-name name no client-name client-namename client name should not include the domain name. For example, thedefault-router address address2 ... address8 default-routerno default-router Speciﬁes the IP address of a router. One IP address is requireddns-server address address2 ... address8 dns-serverno dns-server Speciﬁes the IP address of a DNS server. One IP address is requireddomain-name domain no domain-name domain-namedomain dns-server ip dhcp poolhardware-address hardware-address type hardware-addressno hardware-address hardware-addresshost address mask /preﬁx-length hostno host Speciﬁes the IP address of the clientExample ip dhcp conﬂict loggingip dhcp conﬂict logging no ip dhcp conﬂict logging clear ip dhcp conﬂict ip dhcp database show ip dhcp conﬂictstimeout seconds ip dhcp database url timeout seconds write-delay secondstimeout period are aborted. By default, DHCP waits 300 seconds updates. By default, DHCP waits 300 seconds 5 minutes beforeRelated Commands show ip dhcp databaseip dhcp database Cisco IOS DHCP Serverip dhcp excluded-address low-address high-address ip dhcp excluded-addressno ip dhcp excluded-address low-address high-address low-addressclear ip dhcp conﬂicts ip dhcp ping timeout show ip dhcp conﬂicts address to a requesting client. The default value is two packetsip dhcp ping packets ip dhcp ping packets count no ip dhcp ping packetsip dhcp ping timeout milliseconds no ip dhcp ping timeout ip dhcp ping timeoutassignment. The maximum timeout is 10000 milliseconds 10 seconds. The default timeout is 500 millisecondsip dhcp pool name no ip dhcp pool name ip dhcp poolsuch as host ip dhcp excluded-address network DHCPip dhcp relay information check no ip dhcp relay information check ip dhcp relay information checkip dhcp relay information option ip dhcp relay information policy Defaultsip dhcp relay information option no ip dhcp relay information option ip dhcp relay information optionip dhcp relay information check ip dhcp relay information policy Defaultsip dhcp relay information policy drop keep replace ip dhcp relay information policyno ip dhcp relay information policy droplease days hoursminutes inﬁnite leaseno lease daysnetbios-name-server address address2...address8 netbios-name-serverno netbios-name-server Speciﬁes the IP address of the NetBIOS WINS name servernetbios-node-type type no netbios-node-type netbios-node-typeip dhcp pool netbios-name-server Defaultsnetwork network-number mask /preﬁx-length network DHCPno network network-numberbootﬁle ip dhcp pool ip helper-address option one command linenext-server next-server address address2...address8option code instance number ascii string hex string ip address optionno option code instance number codeip dhcp pool Related Commandsoption Cisco IOS DHCP Serverservice dhcp no service dhcp service dhcpDefaults Command Modesshow ip dhcp binding address show ip dhcp bindingOptional Speciﬁes the IP address of the DHCP client for which bindings will be displayedRelated Commands clear ip dhcp bindingCommand Reference 44 Release 12.01Tshow ip dhcp conﬂict clear ip dhcp conﬂict ip dhcp ping packets ip dhcp ping timeoutshow ip dhcp conﬂict address Defaultsshow ip dhcp database url show ip dhcp databaseDefaults Command ModesRelated Commands ip dhcp databaseshow ip dhcp database show ip dhcp database Field Descriptions continuedDefaults show ip dhcp server statisticsCommand Modes Syntax Descriptionclear ip dhcp server statistics Related Commandsshow ip dhcp server statistics show ip dhcp server statistics Field Descriptionsdebug ip dhcp server Debug CommandsDebug Commands 50 Release 12.01Tevents debug ip dhcp serverpackets linkageGlossary