DNS Network Test

This test reports the efficiency of the Infoblox appliance in an infrastructure by collecting the following information:

  • The rate at which the queries are processed and the percentage of queries processed by the DNS cache;
  • The time duration for which the reply for incoming queries was received from an authoritative server for the last 5 minutes and 15 minutes respectively;
  • The number of queries replied by an authoritative server in the last 5 minutes and last 15 minutes;
  • The time duration for which the reply for incoming queries was received from an authoritative server after referencing another server in the last 5 minutes and 15 minutes respectively; and
  • The number of queries replied by an authoritative server after referencing another server in the last 5 minutes and last 15 minutes respectively.

Target of the test : An Infoblox appliance

Agent deploying the test : An external agent

Outputs of the test : One set of results for the Infoblox appliance that is to be monitored.

Configurable parameters for the test
Parameter Description

Test Period

How often should the test be executed.

Host

The IP address of the Infoblox appliance for which this test is to be configured.

SNMPPort

The port at which the monitored target exposes its SNMP MIB; The default value is 161.

SNMPVersion

By default, the eG agent supports SNMP version 1. Accordingly, the default selection in the SNMPversion list is v1. However, if a different SNMP framework is in use in your environment, say SNMP v2 or v3, then select the corresponding option from this list.

SNMPCommunity

The SNMP community name that the test uses to communicate with the firewall. This parameter is specific to SNMP v1 and v2 only. Therefore, if the SNMPVersion chosen is v3, then this parameter will not appear.

UserName

This parameter appears only when v3 is selected as the SNMPVersion. SNMP version 3 (SNMPv3) is an extensible SNMP Framework which supplements the SNMPv2 Framework, by additionally supporting message security, access control, and remote SNMP configuration capabilities. To extract performance statistics from the MIB using the highly secure SNMP v3 protocol, the eG agent has to be configured with the required access privileges – in other words, the eG agent should connect to the MIB using the credentials of a user with access permissions to be MIB. Therefore, specify the name of such a user against this parameter. 

Context

This parameter appears only when v3 is selected as the SNMPVersion. An SNMP context is a collection of management information accessible by an SNMP entity. An item of management information may exist in more than one context and an SNMP entity potentially has access to many contexts. A context is identified by the SNMPEngineID value of the entity hosting the management information (also called a contextEngineID) and a context name that identifies the specific context (also called a contextName). If the Username provided is associated with a context name, then the eG agent will be able to poll the MIB and collect metrics only if it is configured with the context name as well. In such cases therefore, specify the context name of the Username in the Context text box.  By default, this parameter is set to none.

AuthPass

Specify the password that corresponds to the above-mentioned Username. This parameter once again appears only if the SNMPversion selected is v3.

Confirm Password

Confirm the AuthPass by retyping it here.

AuthType

This parameter too appears only if v3 is selected as the SNMPversion. From the Authtype list box, choose the authentication algorithm using which SNMP v3 converts the specified username and password into a 32-bit format to ensure security of SNMP transactions. You can choose between the following options:

  • MD5 – Message Digest Algorithm
  • SHA – Secure Hash Algorithm

EncryptFlag

This flag appears only when v3 is selected as the SNMPversion. By default, the eG agent does not encrypt SNMP requests. Accordingly, the this flag is set to No by default. To ensure that SNMP requests sent by the eG agent are encrypted, select the Yes option. 

EncryptType

If this EncryptFlag is set to Yes, then you will have to mention the encryption type by selecting an option from the EncryptType list. SNMP v3 supports the following encryption types:

  • DES – Data Encryption Standard
  • AES – Advanced Encryption Standard

EncryptPassword

Specify the encryption password here.

Confirm Password

Confirm the encryption password by retyping it here.

Timeout

Specify the duration (in seconds) within which the SNMP query executed by this test should time out in this text box. The default is 10 seconds.

Data Over TCP

By default, in an IT environment, all data transmission occurs over UDP. Some environments however, may be specifically configured to offload a fraction of the data traffic – for instance, certain types of data traffic or traffic pertaining to specific components – to other protocols like TCP, so as to prevent UDP overloads. In such environments, you can instruct the eG agent to conduct the SNMP data traffic related to the monitored target over TCP (and not UDP). For this, set this flag to Yes. By default, this flag is set to No.

Measurements made by the test
Measurement Description Measurement Unit Interpretation

DNS cache hit ratio

Indicates the percentage of queries that were serviced by the DNS cache.

Percent

A high value is desired for this measure.

DNS query rate

Indicates the rate at which DNS queries were processed by the system.

Queries/sec

 

Non authoritative latency in last 5mins

Indicates the average time during the last 5 minutes the reply for the incoming DNS queries was received from the authoritative server after referencing another server.

Secs

A low value is desired for this measure.

An authoritative zone is a zone for which the local (primary or secondary) server references its own data when responding to queries. The local server is authoritative for the data in this zone and responds to queries for this data without referencing another server.

Non auth queries used in last 5mins

Indicates the number of incoming DNS queries for which the reply was given by the authoritative server after referencing another server during the last 5 minutes.

Number

 

Non authoritative latency in last 15mins

Indicates the average time during the last 15 minutes the reply for the incoming DNS queries was received from the authoritative server after referencing another server.

Secs

A low value is desired for this measure.

Non auth queries used in last 15mins

Indicates the number of incoming DNS queries for which reply was given by an authoritative server by referencing another server during the last 15 minutes.

Number

 

Authoritative latency in last 5mins

Indicates the average time during the last 5 minutes the reply for the incoming DNS queries was received from an authoritative server.

Secs

 

Authoritative queries used in last 5mins

Indicates the number of incoming DNS queries for which reply was received from an authoritative server during the last 5 minutes.

Number

 

Authoritative latency in last 15mins

Indicates the average time during the last 15 minutes the reply for the incoming DNS queries was received from an authoritative server.

Secs

 

Authoritative queries used in last 15mins

Indicates the number of incoming DNS queries for which authoritative reply was given during the last 5 minutes.

Number