IP SLAs DNS Operations
This section describes how to configure the IP SLAs DNS operations to measure the difference between the time taken to send a DNS request and receive a reply.
Guidelines and Limitations for IP SLA DNS Operations
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IPv6 is not supported for IP SLA DNS operations.
DNS Operation
The DNS operation measures the difference between the time taken to send a DNS request and receive a reply. DNS is used in the Internet for translating names of network nodes into addresses. The IP SLAs DNS operation queries for an IP address if you specify a hostname or queries for a hostname if you specify an IP address.
In the following figure, Device B is configured as the source IP SLAs device and a DNS operation is configured with the DNS server as the destination device.
The connection response time is computed by measuring the difference between the time taken to send a request to the DNS server and the time a reply is received by Device B. The resulting DNS lookup time can help you analyze your DNS performance. Faster DNS lookup times translate to a faster web server access experience.