DNS-RESOLVER-MIB

MIB Reference — IPNetwork Monitor · Updated September 09, 2026

All MIBsDNS-RESOLVER-MIB

Organization: IETF DNS Working Group

Last Updated: 1994-01-28

Category: Web and Application Servers

Description: Defines managed objects for DNS resolver software, enabling SNMP-based management of DNS resolver configuration, cache, and query statistics.

IPNetwork Monitor uses several OIDs from this MIB in network discovery and polling the applicable devices. Start monitoring DNS-RESOLVER-MIB with a free 30-day trial of IPNetwork Monitor.

What Is DNS-RESOLVER-MIB?

DNS-RESOLVER-MIB is a vendor-neutral IETF standards-track MIB for managing the client-side DNS resolver software on a host or networking device. It exposes resolver configuration such as the search belt (default name servers), implementation identity, recursion behavior, and query statistics/counters. It is used to monitor DNS resolver software status and configuration — confirming which name servers are configured, resolver service state, and query counters that catch resolution failures or misconfiguration. The DNS-RESOLVER-MIB RFC (RFC 1612) defines this module's objects independent of any vendor implementation, so it can be loaded on any compliant host or device. It has little role in hardware monitoring since it covers software (DNS resolver) status, and it stands alone as a standards MIB without dependency on specific enterprise MIBs. It is typically deployed on servers, routers, or any networked device performing DNS name resolution, for troubleshooting name-resolution problems.

IPNetwork Monitor allows you to monitor SNMP objects defined in DNS-RESOLVER-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

  • vendor-neutral, standards-based MIB, not tied to a specific manufacturer — applies to any host or network device running DNS resolver software

Monitoring Examples

An admin can poll dnsResConfigSbeltTable/dnsResConfigSbeltEntry to verify configured name servers (dnsResConfigSbeltAddr, dnsResConfigSbeltName) and their preference order (dnsResConfigSbeltPref), useful when diagnosing lookup failures after a DNS server change. dnsResConfigMaxCnames bounds CNAME chain following, and dnsResCounter tracks resolver query volume, revealing spikes in failed lookups when a configured server becomes unreachable.

What Can Be Monitored

  • configured DNS server addresses (search belt)
  • server preference order
  • recursion support per server
  • max CNAMEs followed
  • resolver query counters
  • resolver implementation identity
Imported Objects

From DNS-SERVER-MIB

DnsClass
DnsName
DnsNameAsIndex
DnsOpCode
DnsQClass
DnsQType
DnsRespCode
DnsTime
DnsType
dnsOBJECT-IDENTITY

From SNMPv2-CONF

MODULE-COMPLIANCE
OBJECT-GROUP

From SNMPv2-SMI

Counter32
Integer32
IpAddress
MODULE-IDENTITY
OBJECT-TYPE

From SNMPv2-TC

DisplayString
RowStatus
TEXTUAL-CONVENTION
OIDs

FAQ

How can DNS-RESOLVER-MIB help troubleshoot name-resolution problems on a server?
It exposes the resolver's configured DNS server addresses (search belt), server preference order, per-server recursion support, and max CNAMEs followed, along with query counters — so an operator can confirm which name servers are actually configured and spot query counters indicating resolution failures or misconfiguration.

Does DNS-RESOLVER-MIB tell you anything about the resolver software itself, not just its configuration?
Yes, it includes resolver implementation identity alongside query statistics/counters, useful for confirming which DNS resolver software is running on a host in addition to how it's configured.

RFC description

Defines management objects for DNS resolver configuration and statistics (RFC 1612).

Start monitoring Host/network device running DNS resolver client software (vendor-neutral, RFC 1612) 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.

Download DNS-RESOLVER-MIB