DNS Performance Summary report

DNS Performance Summary report overview

The DNS Performance Summary report shows a summary of DNS performance for a specified set of applications using RTT values and session counts.

Note: The DNS servers are modeled as applications and must be selected from the Application drop-down menu in the prompt section of the report.

Note: This report requires special study statistics collection by an NSP Flow Collector for each modeled DNS server application. See the workflow to configure AA Cflowd special-study statistics collection in the NSP NFM-P Statistics Management Guide for configuration information.

If the user chooses an application that does not represent a DNS application, the application will appear in the report but the information provided will be invalid. If the user chooses a DNS application that is not configured for special studies collection, the application will not appear in the report.

Use cases

User quality of experience—Use the report to anticipate user QoE issues by monitoring DNS performance to identify potential network issues.

Report characteristics

The following table lists the principal report characteristics.

Table 9-4: DNS Performance Summary report characteristics

Characteristic

Value

Statistics type

AA Cflowd comprehensive special study

NSP Flow Collector required

Yes

Domains

Residential / Wi-Fi (ESM)

Mobile

Wi-Fi (DSM)

Business

Report inputs

Prompt

Notes

End date

Calendar date or relative date (for example, two days ago) and time

Granularity

Aggregation types:

  • None (raw data)

Report range

Length of time to be reported, in minutes (minutes, min), hours (hours, h), days (days, d), weeks (w), or months (months, m)

Node Type

Search using partial names or wildcard (%).

Select individual items or click Select All.

Node

Group/Partition

Search using partial names or wildcard (%).

Application

Search using partial names or wildcard (%).

Select individual items or click Select All.

Drill-down support

Yes—See DNS Performance RTT Details and DNS Performance Session Details

Example

The following figures show a report example.

Figure 9-7: DNS Performance Summary report
DNS Performance Summary report
Figure 9-8: DNS Performance Summary—DNS Session Count
DNS Performance Summary—DNS Session Count
Figure 9-9: DNS Session Distribution—by # Packets in Each Session
DNS Session Distribution—by # Packets in Each Session

The vertical axis of the DNS Session Distribution heat map shows the number of DNS requests made from the client to the server.  The horizontal axis shows the number of responses sent from the server to the client. 

Each cell shows the number of sessions observed that had X requests from the client to the server, and Y responses from the server to the client.  For example, a 1 indicates one DNS request to the server and a matching response from the server to the client.

The following points may be useful for troubleshooting: