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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.

$oDns = ObjCreate("Chilkat.Dns")

;  Indicate our TLS preference:
;  0: No TLS
;  1: Prefer TLS if possible
;  2: Require TLS
$oDns.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.
$oDns.RemoveAllNameservers 

;  Add the Google and Cloudfare nameservers.
Local $bSupportsTls = True
$oDns.AddNameserver "1.1.1.1",$bSupportsTls
$oDns.AddNameserver "8.8.8.8",$bSupportsTls
$oDns.AddNameserver "1.0.0.1",$bSupportsTls
$oDns.AddNameserver "8.8.4.4",$bSupportsTls

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