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OPNsense set up and configure DNS Over TLS (DoT)

OPNsense is an open-source, FreeBSD-based firewall and routing security software. It also acts as a DNS resolver for all of your desktops and mobile devices. Let us see how to configure the OPNsense DNS resolver to encrypt all DNS queries to protect from eavesdropping to increase our privacy and security.
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Unbound is a free and open source BSD licensed caching DNS resolver. It also works with DNSSEC and in recursive mode. Coded in C programming language. It means it runs on Linux, Windows, *BSD and Unix-like operating system.
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How to setup Quad9 DNS on a Linux

Domain Name Servers (DNS) are essential for the Internet. Every computer or mobile device use DNS to access websites, email servers, APIs and other stuff. One must configure a DNS service. You can use your ISP’s DNS, Google DNS, and OpenDNS. Now you have one more option from IBM. It is called Quad9 DNS service. It can block malicious domains for everyone. You can get an additional layer of protection.
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Tata docomo broadband/ADLS DNS server IP address

Tata Docomo is an Indian mobile network operator and FTTH/ADSL2 internet service provider. It is a part of Tata Teleservices. It operates both GSM and CDMA cellular network and wired broadband in India.
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The dt command is free and open source tool written in Go language. It is a CLI DNS tool that displays information about your domain name on UNIX-like system.
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BSNL DNS Server IP

The BSNL (Bharat Sanchar Nigam Limited) is government owned internet and cellular service provider. It is believed that BSNL has 60% market share and considered as the largest provider of fixed telephony and broadband services across the pan India.
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Google IPv6 Public DNS Support

Google provides an excellent set of public DNS servers but it won’t work on an native IPv6 address or transport. From the official google help pages:
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How do I test that my BIND dns server is not acting as Open resolvers? How do I test if server is acting as open resolver for abusing the large DNS queries?
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How do I disable the bind version.bind option under UNIX or Linux operating systems to improve my name server security?
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Website Not Reachable Error

The error message “website not reachable” means lots of things. Some can be controlled from your end others can be only controlled by website owner or person who is responsible for the website.
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