DHCPCLIENT-PRIVATE-MIB

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Organization: QCI

Last Updated: 2011-08-31

Category: Protocol: DHCP

Description: Private MIB for DHCP client configuration and monitoring including lease state, assigned addresses, and renewal timers.

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What Is DHCPCLIENT-PRIVATE-MIB?

This is a private (vendor not identified in the available source) MIB for configuring and monitoring a device's own DHCP client, the software component that obtains an IP address from an upstream DHCP server. It exposes the client's lease state, the currently assigned IP address, and renewal timers. As a monitoring module it is directly useful for confirming the software health of the device's network addressing -- whether it currently holds a valid lease, what address it obtained, and how soon renewal will occur -- which is a fundamental connectivity check for any DHCP-addressed device. It builds on standard DHCP client concepts (RFC 2131) as a vendor-specific management extension exposing that state via SNMP. The DHCPCLIENT-PRIVATE-MIB MIB is deployed on network appliances, embedded devices, or CPE equipment that obtain their management IP address via DHCP, monitored via SNMP once reachable.

IPNetwork Monitor allows you to monitor SNMP objects defined in DHCPCLIENT-PRIVATE-MIB. Use the built-in SNMP Monitoring Browser to explore available variables, view their current values and descriptions, and select the objects you want to monitor. You can then create SNMP monitors, configure thresholds, and receive alerts when monitored values change.

Supported Devices

Quanta (QCI) enterprise/data-center switch (DHCP client) — Identified as Quanta (QCI) via the module's own ORGANIZATION field and its QUANTA-SWITCH-MIB import, not 'vendor not identified' as previously described — consistent with the sibling DENIALOFSERVICE-PRIVATE-MIB module (also QCI) researched in a prior round.

Monitoring Examples

No specific object or table names were included in the source excerpt for this module; based on its description, an administrator would poll the client's lease-state object to confirm the device currently holds a bound lease, check the assigned-address object against the expected subnet, and watch the renewal timer to anticipate when the client will next attempt to renew -- a lease state stuck in a non-bound value would explain a device that has silently lost network connectivity.

What Can Be Monitored

DHCP client lease state
currently assigned IP address
lease renewal timer

Imported Objects

From IF-MIB

InterfaceIndex

From QUANTA-SWITCH-MIB

switch

OBJECT-IDENTITY

From RFC1213-MIB

DisplayString

From SNMPv2-SMI

Counter32
Integer32
IpAddress
MODULE-IDENTITY
NOTIFICATION-TYPE
OBJECT-TYPE
TimeTicks
Unsigned32

How to Use in IPNetwork Monitor

Example using agentdhcp4ClientRetryCount OID:

Select a Quanta enterprise/data-center switch (DHCP client) as the target host to create a monitor — the SNMP service should be up and running on it. Click New Monitor, then check SNMP Custom on the Favorites tab, click Next, and confirm the host. On the next page, click Select... to open the built-in SNMP MIB Browser and type agentdhcp4ClientRetryCount into the Find box to locate it in the OID tree, selecting the specific row/instance you want to monitor since this is a table column, then select it and click OK. The number of times the DHCP Client sends a DHCP REQUEST message before the server responds . On the monitor's Main parameters page you can set the target's SNMP port (default 161), credentials, polling interval, and other settings — see the SNMP Monitor help for details. On the State conditions and Alerting tabs, configure when the monitor should change state and trigger an alert; since this is a Counter32-type OID, Value bounds is the most useful condition here — trigger an alert if the counter increases sharply between polls relative to its normal baseline, since an unexpected spike often reflects a real change in traffic or activity. Click Finish to create the monitor; you can adjust any parameter later.

OIDs

OID symbolic	OID numeric	Type	Access	Description
dhcpClientPrivate	1.3.6.1.4.1.7244.2.100			The Private MIB for DHCP Client
agentdhcp4ClientLeaseParameters	1.3.6.1.4.1.7244.2.100.1
agentdhcp4ClientLeaseParametersTable	1.3.6.1.4.1.7244.2.100.1.1		not-accessible	Displays DHCP Client Lease Information.
agentdhcp4ClientLeaseParametersEntry	1.3.6.1.4.1.7244.2.100.1.1.1		not-accessible	Information about a table entry.
NUM agentdhcp4ClientInterfaceIndex	1.3.6.1.4.1.7244.2.100.1.1.1.1	InterfaceIndex	not-accessible	The Interface index on which the IP address was leased by the DHCP Server.
IP agentdhcp4ClientIpAddress	1.3.6.1.4.1.7244.2.100.1.1.1.2	IpAddress	read-only	The IP Address leased by the DHCP Server .
IP agentdhcp4ClientSubnetMask	1.3.6.1.4.1.7244.2.100.1.1.1.3	IpAddress	read-only	The Subnet mask of the IP Address leased by the DHCP Server .
IP agentdhcp4ClientDhcpServerAddress	1.3.6.1.4.1.7244.2.100.1.1.1.4	IpAddress	read-only	The IP Address of the DHCP Server that leased the IP Address .
INT agentdhcp4ClientState	1.3.6.1.4.1.7244.2.100.1.1.1.5	INTEGER	read-only	The State of the DHCP Client on this interface .
STR agentdhcp4ClientTransactionID	1.3.6.1.4.1.7244.2.100.1.1.1.6	DisplayString	read-only	The transaction ID of the DHCP Client .
TIK agentdhcp4ClientLeaseTime	1.3.6.1.4.1.7244.2.100.1.1.1.7	TimeTicks	read-only	The time remaining since the IP address is leased by the DHCP Server.It is displayed in days, hours, minutes and seconds.
TIK agentdhcp4ClientRenewTime	1.3.6.1.4.1.7244.2.100.1.1.1.8	TimeTicks	read-only	The time remaining to send the next DHCP Renew Request by DHCP Client to renew the leased IP address. It is displayed in days, hours, minutes and seconds.
TIK agentdhcp4ClientRebindTime	1.3.6.1.4.1.7244.2.100.1.1.1.9	TimeTicks	read-only	The time remaining to start the DHCP Rebind process. It is displayed in days, hours, minutes and seconds.
C32 agentdhcp4ClientRetryCountEx	1.3.6.1.4.1.7244.2.100.1.1.1.10	Counter32	read-only	The number of times the DHCP Client sends a DHCP REQUEST message before the server responds .

RFC description

Quanta DHCP client private MIB for monitoring DHCP lease information, client state, and server address on network interfaces.

Start monitoring Quanta enterprise/data-center switch (DHCP client) with a free 30-day trial of IPNetwork Monitor. Import MIBs, browse SNMP OIDs, create custom SNMP monitors, configure alerts, and monitor any SNMP-enabled network device from a single console.

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