Allowing DNS to listen only on UDP

[Tony Finch]

Harshith Mulky <harshith.mulky at outlook.com> wrote:
>
> Is there a easy way to turn off/ Disable the DNS server to stop
> listening the requests over TCP and turn it ON whenever required?

It is always required :-)

As well as what Reindl said, you might like to look at:

https://tools.ietf.org/html/rfc7766
 - DNS Transport over TCP - Implementation Requirements

https://tools.ietf.org/html/draft-kristoff-dnsop-dns-tcp-requirements
 - DNS Transport over TCP - Operational Requirements

Tony.
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