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STARTTLS is DNS is no longer described in any active draft, but is still available in these patches.


TFO patches

Various TFO patches are provided - please see the TFO patch repository.

LDNS:  ldns.1.6.17_dns-over-tls.patch


  1. apply patch
  2. run 'autoreconf --force'
  3. optionally specify the --enable-tcp-fastopen  and/or --enable-TObit flags and when running 'configure'
  4. make, make install

DNSPerf: add_tcp.patch


  • Added a -z option to tell dnsperf to use TCP. This is a single long lived TCP session per client. Multiple DNS queries sent over a single TCP session.
  • Only tested on OS X right now.