Domain Monitor

Domain monitors have the following configuration options:
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Configure Domain Monitor
Domain monitors have the following configuration options:
  •  
    Number of Retries
    Defines the number of times that unanswered requests are retried.
  •  
    TCP or UDP
    Specifies the communication protocol.
    Default:
     
    UDP
     
    Not all servers support TCP. Some firewalls do not allow TCP communication to DNS servers. To use TCP, verify that your DNS servers support TCP.
  •  
    Minimum Number of NS that Respond
    Specifies the minimum number of servers that require a correct response for the monitor. Use UDP for faster delivery.
  •  
    DNS Zone Transfer
    Specifies the transaction type. Select 
    ANY
     to execute requests from all locations.
    Default: 
     
    ANY
     
    AXFR servers can be restricted. Not all servers respond to zone transfer queries or reply to all requests.
  •  
    DNS Servers
    Specifies the server that the test queries. Select one of the following options:
    •  
      DNS List
      Queries all the name servers that are listed in the 
      NS
       records for the 
      hostname
      .
    •  
      Custom
      Lets you enter a custom list of name servers to query. Use commas to separate the IP addresses of the servers
Domain Monitor Workflow 
The following diagram shows the Domain monitor workflow:
Domain monitor workflow
Domain monitor workflow
Collected Metrics Process
The following diagram shows the metric collection process of the Domain monitor:
Domain Monitor Metrics
Domain Monitor Metrics
Collected Metrics
 
Metric Name
 
 
Unit
 
 
Description
 
Resolve Time ( 
rtime
 )
Milliseconds
The time to retrieve the 
NS
 Resource Record
 this metric is applicable only when you select the 
As Listed
 option.
Processing Time ( 
ptime
 )
Milliseconds
The duration of the fastest response.
Query Time ( 
dtime
 )
Milliseconds
The average duration of all NS lookups.
Download Size ( 
dsize
 )
Bytes
The average size of all NS responses.
Error Messages
For more information about possible error messages, see Error Messages.