Settings for handling queries to a domain name system server (DNS server).
|IP protocol version preference
Lets you select the protocol version that is preferred when retrieving IP addresses from a DNS server.
A query for retrieving IP addresses from a DNS server can result in multiple IPv4 of IPv6 addresses, Whether an IPv4 or an IPv6 address is used for setting up a connection, depends on what you have configured above.
When multiple IP addresses are available within the same address family (IPv4 or IPv6), addresses are sorted according to several parameters. Connection attempts are then made using these addresses in the order in which they are sorted.
The parameters for sorting IP addresses are listed in the following. They are applied in the order they are listed.
Minimal TTL for DNS cache
Sets a minimum time (in seconds) that must have elapsed before data stored in the DNS cache is deleted.
Maximal TTL for DNS cache
Set a maximum time (in seconds) that must have elapsed before data stored in the DNS cache is deleted.
Flush DNS cache
Flushes the DNS cache.