Lua Requires Chilkat v9.5.0.96+

Use Public DNS Servers (Google and Cloudfare)

See more DNS Examples

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

local chilkat = require("chilkat")

-- 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.

local dns = chilkat.Dns.new()

-- Indicate our TLS preference:
-- 0: No TLS
-- 1: Prefer TLS if possible
-- 2: Require TLS
dns.tls_pref = 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:remove_all_nameservers()

-- Add the Google and Cloudfare nameservers.
local supportsTls = true
dns:add_nameserver("1.1.1.1", supportsTls)
dns:add_nameserver("8.8.8.8", supportsTls)
dns:add_nameserver("1.0.0.1", supportsTls)
dns:add_nameserver("8.8.4.4", supportsTls)

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