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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.