(Visual Basic 6.0) Use Public DNS Servers (Google and Cloudfare)

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Demonstrates how to use Google and Cloudfare nameservers for all DNS lookups within Chilkat.

Note: This example requires Chilkat v9.5.0.96 or later.

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' The new Chilkat DNS class is a singleton that allows an applicaton to select 
' the DNS nameservers used throughout Chilkat.

' "singleton" means that all Chilkat DNS object instances work with a single
' copy of internal DNS settings that are application wide.

' Chilkat does DNS lookups internally whenever a domain name is passed to a Chilkat method, or when the domain
' name is part of a URL passed to a Chilkat method.  It could be in HTTP, Ftp2, SSH, IMAP, Socket, etc.

' This exampel will show how to use the Cloudfare and Google DNS servers.
' 
' Google Public DNS:
'   - Primary DNS: 8.8.8.8
'   - Secondary DNS: 8.8.4.4
'   Google Public DNS is known for its speed and reliability. It's operated by Google and is widely used by many internet users.

' Cloudfare Public DNS:
'   - Primary DNS: 1.1.1.1
'   - Secondary DNS: 1.0.0.1
'   Cloudfare Public DNS is also known for its speed and reliability, and is also widely used.

Dim dns As New ChilkatDns

' Indicate our TLS preference:
' 0: No TLS
' 1: Prefer TLS if possible
' 2: Require TLS
dns.TlsPref = 0

' If you choose "No TLS", then all DNS requests will use UDP, or TCP for those requests with large responses.
' Choosing "No TLS" provides the fastest DNS lookups, and is generally what you're already doing.

' If you choose "Prefer TLS if possible", then Chilkat will use DNS over TLS for those nameservers that
' support TLS.

' If you choose "Require TLS", then Chilkat will ignore nameservers that don't support TLS,
' and all DNS communications will occur over private and secure TLS connections.

' When you specify a nameserver to be used, you'll tell Chilkat whether it supports DNS or not.
' Here' we're setting the nameservers to Google and Cloudfare.
' They both support TLS, but since we set our TLS preference = 0, Chilkat will not use TLS.
' (If we set our TLS preference equal to 1 or 2, then Chilkat will use TLS for Google and Cloudfare DNS.)

' First, make sure we remove all existing nameservers.
dns.RemoveAllNameservers 

' Add the Google and Cloudfare nameservers.
Dim supportsTls As Long
supportsTls = 1
dns.AddNameserver "1.1.1.1",supportsTls
dns.AddNameserver "8.8.8.8",supportsTls
dns.AddNameserver "1.0.0.1",supportsTls
dns.AddNameserver "8.8.4.4",supportsTls

' That's it.  Now all DNS lookups in Chilkat will use the above nameservers.