DNS Lookup Test
This test emulates an 'nslookup' command to a DNS server for resolving a configured IP/host name, and reports the availability of the DNS server, the success/failure of the command, and the speed with which the server responded to the command. In practice, NsLookup reaches out over the Internet to do a DNS lookup from an authorized name server, and then formats the information returned for convenient display. Based on the statistics reported, administrators can figure out whether the DNS server is available over the network and also identify slowdowns in the responsiveness of the server.
Target of the test : Any host system
Agent deploying the test : An internal agent
Outputs of the test : One set of results for every network interface of the target host
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Measurement | Description | Measurement Unit | Interpretation | ||||||
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DNS server availability: |
Indicates the availability of DNS Server. |
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The values for the availability of the DNS Server is provided in the table below:
Note: By default, this measure can report the Measure Values mentioned above while indicating the availability of DNS Server. However, the graph of this measure is indicated using the numeric equivalents. The detailed diagnosis for this measure provides the IP or the DNS Server Name, only when the DNS server is in available state. |
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DNS lookup success: |
Indicates the status of the NSLookup for the server. |
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The values for the status of the NSLookup is provided in the table below:
Note: By default, this measure can report the Measure Values mentioned above while indicating the status of the NSLookup for the server. However, the graph of this measure is indicated using the numeric equivalents. When the value is 0 (i.e. Lookup not Successful), the detailed diagnosis for this measure provides the reason for the NSLookup failure. |
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DNS lookup time: |
Indicates the response time of the NSLookup. |
Seconds |
Ideally, the value of this measure should be low. |