<PackageReference Include="Microsoft.Data.SqlClient" Version="7.1.0" />

Microsoft.Data.SqlClient.SqlConnectionIPAddressPreference

public enum SqlConnectionIPAddressPreference
Specifies a value for IP address preference during a TCP connection.
IPv4First = 0

Connects using IPv4 address(es) first. If the connection fails, try IPv6 address(es), if provided. This is the default value.

IPv6First = 1

Connect using IPv6 address(es) first. If the connection fails, try IPv4 address(es), if available.

UsePlatformDefault = 2

Connects with IP addresses in the order the underlying platform or operating system provides them.