|Primary DNS server
|The IP address of the primary DNS server.
|Secondary DNS server
|The IP address of the secondary DNS server.
|Enable DNS cache
|Enable to cache the responses to DNS queries.
|DNS cache maximum TTL
|When DNS cache is enabled, configure the length of time in seconds responses to DNS queries are cached. If the configured value is larger than the time to live (TTL) value specified in the DNS record, the DNS TTL value is used. The default is set to 0, which uses the TTL value specified in the DNS record.