DHCPv4 fields

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DHCPv4 event fields

dhcpv4.transaction_id

Transaction ID, a random number chosen by the client, used by the client and server to associate messages and responses between a client and a server.

type: keyword

dhcpv4.seconds

Number of seconds elapsed since client began address acquisition or renewal process.

type: long

dhcpv4.flags

Flags are set by the client to indicate how the DHCP server should its reply — either unicast or broadcast.

type: keyword

dhcpv4.client_ip

The current IP address of the client.

type: ip

dhcpv4.assigned_ip

The IP address that the DHCP server is assigning to the client. This field is also known as "your" IP address.

type: ip

dhcpv4.server_ip

The IP address of the DHCP server that the client should use for the next step in the bootstrap process.

type: ip

dhcpv4.relay_ip

The relay IP address used by the client to contact the server (i.e. a DHCP relay server).

type: ip

dhcpv4.client_mac

The client’s MAC address (layer two).

type: keyword

dhcpv4.server_name

The name of the server sending the message. Optional. Used in DHCPOFFER or DHCPACK messages.

type: keyword

dhcpv4.op_code

The message op code (bootrequest or bootreply).

type: keyword

example: bootreply

dhcpv4.hops

The number of hops the DHCP message went through.

type: long

dhcpv4.hardware_type

The type of hardware used for the local network (Ethernet, LocalTalk, etc).

type: keyword

dhcpv4.option.message_type

The specific type of DHCP message being sent (e.g. discover, offer, request, decline, ack, nak, release, inform).

type: keyword

example: ack

dhcpv4.option.parameter_request_list

This option is used by a DHCP client to request values for specified configuration parameters.

type: keyword

dhcpv4.option.requested_ip_address

This option is used in a client request (DHCPDISCOVER) to allow the client to request that a particular IP address be assigned.

type: ip

dhcpv4.option.server_identifier

IP address of the individual DHCP server which handled this message.

type: ip

dhcpv4.option.broadcast_address

This option specifies the broadcast address in use on the client’s subnet.

type: ip

dhcpv4.option.max_dhcp_message_size

This option specifies the maximum length DHCP message that the client is willing to accept.

type: long

dhcpv4.option.class_identifier

This option is used by DHCP clients to optionally identify the vendor type and configuration of a DHCP client. Vendors may choose to define specific vendor class identifiers to convey particular configuration or other identification information about a client. For example, the identifier may encode the client’s hardware configuration.

type: keyword

dhcpv4.option.domain_name

This option specifies the domain name that client should use when resolving hostnames via the Domain Name System.

type: keyword

dhcpv4.option.dns_servers

The domain name server option specifies a list of Domain Name System servers available to the client.

type: ip

dhcpv4.option.vendor_identifying_options

A DHCP client may use this option to unambiguously identify the vendor that manufactured the hardware on which the client is running, the software in use, or an industry consortium to which the vendor belongs. This field is described in RFC 3925.

type: object

dhcpv4.option.subnet_mask

The subnet mask that the client should use on the currnet network.

type: ip

dhcpv4.option.utc_time_offset_sec

The time offset field specifies the offset of the client’s subnet in seconds from Coordinated Universal Time (UTC).

type: long

dhcpv4.option.router

The router option specifies a list of IP addresses for routers on the client’s subnet.

type: ip

dhcpv4.option.time_servers

The time server option specifies a list of RFC 868 time servers available to the client.

type: ip

dhcpv4.option.ntp_servers

This option specifies a list of IP addresses indicating NTP servers available to the client.

type: ip

dhcpv4.option.hostname

This option specifies the name of the client.

type: keyword

dhcpv4.option.ip_address_lease_time_sec

This option is used in a client request (DHCPDISCOVER or DHCPREQUEST) to allow the client to request a lease time for the IP address. In a server reply (DHCPOFFER), a DHCP server uses this option to specify the lease time it is willing to offer.

type: long

dhcpv4.option.message

This option is used by a DHCP server to provide an error message to a DHCP client in a DHCPNAK message in the event of a failure. A client may use this option in a DHCPDECLINE message to indicate the why the client declined the offered parameters.

type: text

dhcpv4.option.renewal_time_sec

This option specifies the time interval from address assignment until the client transitions to the RENEWING state.

type: long

dhcpv4.option.rebinding_time_sec

This option specifies the time interval from address assignment until the client transitions to the REBINDING state.

type: long

dhcpv4.option.boot_file_name

This option is used to identify a bootfile when the file field in the DHCP header has been used for DHCP options.

type: keyword