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SmartDNS – local DNS server that forwards to multiple upstream DNS servers

by thejosh on 7/25/23, 3:44 PM with 3 comments

• by LinuxBender on 7/25/23, 3:52 PM

  Those running Unbound DNS and likely anyone on PiHole which uses Unbound can already benefit from talking to the fastest upstream DoT/DoH providers and may configure the balance or preference without leaking the same name to each provider, if I am understanding the diagram and documentation correctly regarding SmartDNS. Unbound can passively keep track of how fast each upstream provider is [1] and supports DoT/DoH if DoH support was compiled in and can forward specific zones to non DoT if required.

      fast-server-num: 4
      fast-server-permil: 200
  
      forward-zone:
      name: "."
      forward-addr: 74.82.42.42@853#ordns.he.net
      forward-addr: 45.67.219.208@853#dot.la.ahadns.net
      forward-addr: 185.235.82.82@853#b.ns.dnslify.com
      forward-addr: 141.95.160.38@853#geo.dnswarden.com
      forward-addr: 146.255.56.98@853#dot1.applied-privacy.net
      forward-addr: 144.202.69.149@853#adblockdot.us.dnswarden.com
  

  In the above example we balance across the 4 fastest of those providers 200 out of 1000 times. Using DoT examples as not every Linux distribution compiles in DoH support

  [1] - https://unbound.docs.nlnetlabs.nl/en/latest/manpages/unbound... [search for fast-server-permil]