The Domain Name Server (DNS) resolver is a session layer protocol that maps network host names to IP addresses (and vice versa). The client function queries configured servers to provide mapping services for CLI commands (for example, ping, telnet) which allow a hostname to be specified.
The DNS resolver feature is enabled by default. Up to four DNS servers can be configured for DNS resolution. The domain name (Net, Host, Gateway, or Domain name) associated with this device can be configured. A default DNS zone can be specified indicating the initial zone used for DNS lookup. Supported zones are IPv4 and IPv6. The default zone is IPv4. The default zone names are:
The port number the DNS resolver uses for DNS queries can be configured. The default port is 53. DNS requests will time out and retry the request after a configurable number of seconds. After a configurable amount of retries, if there is more than a single DNS server configure, the request will be sent to the next configured server for up to the number of configured retries.
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