RFC2136_TSIG_KEY="Name of the secret key as defined in DNS server configuration. To disable TSIG authentication, leave the `RFC2136_TSIG*` variables unset."
RFC2136_TSIG_ALGORITHM="TSIG algorithm. See [miekg/dns#tsig.go](https://github.com/miekg/dns/blob/master/tsig.go) for supported values. To disable TSIG authentication, leave the `RFC2136_TSIG*` variables unset."