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Clients with Significant Number of DNS Failures
The insight can be accessed from the , , and context. This insight provides information on excessive request failures from the DNS Domain Name System. A DNS server functions as a phone book for the intranet and Internet users. It converts human-readable computer host names into IP addresses and IP addresses into host names. It stores several records for a domain name such as an address 'A' record, name server (NS), and mail exchanger (MX) records. The Address 'A' record is the most important record that is stored in a DNS server, because it provides the required IP address for a network peripheral or element. servers. It is categorized under connectivity since there is a high number of request failures. This insight displays the following information:
Insight Summary
The insight summary provides the following details:
- —Displays the possible causes for which the failure occurred.
- —Displays the possible recommendation against each failure to resolve the same.
- —Displays the exact number and percentage of failures that occurred against each failure reason.
Time Series Graph
The time series graph displays the number of request failures from the DNS server that occurred during the selected time. You can hover your mouse on each bar graph to see the exact number of failures.
Cards
The cards vary based on the context that you access the insight from. Click one of the cards to view further details:
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Cards |
Context |
|---|---|
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Global |
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Global, Site, Device |
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Global, Site |
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Global, Site, Device |
Site
Lists the number of sites that experience request failures from the DNS server in the network. Click the arrow 
to view the pictorial graph of the sites. Click the number displayed on the card, to view a detailed description of the impacted sites:
- —Name of the site impacted by the insight and link to the specific insight at the site context.
- —Total number of failure packets out of transferred packets at the site multiplied by 100.
- —Number of query attempts sent to the DNS server in a site.
- —Percentage of successful DNS queries in a site.
- —Error in the DNS query format sent to the DNS server in a site.
- —DNS request failed to complete, and the server responds with an error code.
- —Domain name sent to the DNS server does not exist and the server responds with an error code.
- —Function is not implemented on the DNS server and the server responds with an error code.
- —Server refused to answer the query and responds with an error code.
Server
Lists the number of servers that have the most number of DNS request rejections. Click the arrow to view the pictorial graph of the servers. Click the number displayed on the card to view a detailed description of the impacted servers:
- —IP address of each server.
- —Total number of failure packets out of transferred packets at the site multiplied by 100
- —Number of query attempts sent to the DNS server
- —Percentage of successful DNS queries.
- —Error in the DNS query format sent to the DNS server in a site.
- —DNS request failed to complete, and the server responds with an error code.
- —Domain name sent to the DNS server does not exist and the server responds with an error code.
- —Function is not implemented on the DNS server and the server responds with an error code.
- —Server refused to answer the query and responds with an error code.
Access Point
Lists the number and details of access points that have the most number of DNS request rejections. Click the arrow to view a pictorial graph of the access points. Click the drop-down list to view the following:
—Graphical representation of the total failures and total successful requests that occurred at the server.
Click the number displayed on the card, to view a detailed description of the impacted access points:
- —Name of the access points and link to the specific insight at the AP context.
- —MAC Media Access Control. A MAC address is a unique identifier assigned to network interfaces for communications on a network. address of the AP and link to the specific insight at the AP context.
- —Serial number of the AP.
- —Total number of failure packets out of transferred packets at the site multiplied by 100.
- —Number of query attempts sent to the DNS server in each AP.
- —Percentage of successful DNS queries in each AP.
- —Error in the DNS query format sent to the DNS server in each AP.
- —DNS request failed to complete, and the server responds with an error code.
- —Domain name sent to the DNS server does not exist and the server responds with an error code.
- —Function is not implemented on the DNS server and the server responds with an error code.
- —Server refused to answer the query and responds with an error code.
- —Name of the site where the AP resides.
Client
Lists the client name and number of DNS request rejections in each client. Click the arrow to view the pictorial graph of the clients. Click the number displayed on the card, to view a detailed description of the impacted clients:
- —Name of the impacted client and link to the specific insight at the client context.
- —MAC address of the client and link to the specific insight at the client context.
- Total Failures—Total number of DNS request rejections in each client.
- Query Attempts—Number of DNS query attempts in each client.
- Query Success—Number and percentage of successful query attempts in each client.
- Query Format Error—Number of errors due to query format.
- Request Failed to Complete—Number of incomplete DNS requests in each client.
- Domain Name does Not Exist—Number failures due to absence of domain name.
- Function Not Implemented—Number of failures due to function not implemented.
- Server Refused to Answer Query—Number of failures due to server rejections.
- Device Type—Type of OS where the client resides.
- Top Hostnames—Hostnames that each client was trying to access.
