Version 1.0 of getdns offers a daemon mode which can be used to run getdns locally as a DNS-over-TLS stub resolver. The daemon can listen on the loopback address send all outgoing DNS queries over TLS to a DNS Privacy server. Version 1.1 of getdns includes some performance improvements to make this mode more robust, so it is currently recommended to use that code, rather than the 1.0 release. If you want to set this up on your laptop/desktop follow the step-by-step instructions below!
In this mode, the only dependency is OpenSSL (version 1.0.2 or later is required for hostname authentication to be supported). If this is installed in a non-standard location on your system use the --with-ssl option to configure below to specify where it is.
It may be necessary to install 1.0.2 from source for most Linux distros.
It is recommended to install OpenSSL using homebrew, in which case use the following in the configure line in 1.3 below:
The command below will run the daemon listening on port 53 of the loopback address and sending queries to the NLnet Labs test DNS Privacy server (at 126.96.36.199 and 2a04:b900:0:100::38) over TLS. (More test servers are listed here).
It also specifies an example idle timeout on the TLS connection of 10s with the '-e 10000' option. (Note: the NLnet Labs test server does not support EDNS0 TCP Keepalive yet, so in that case this timeout will always be used.)
It is recommended to use more than one upstream for increased performance and reliability.
IPv4 and IPv6
You can specify multiple upstreams just by repeating the @<address> element on the command line.
Exit the daemon at any time by hitting CTRL-C.
Strict vs Opportunistic
The above command will run the daemon without trying to authenticate the TLS connection (a form of Opportunistic Privacy).
If you have authentication information for the DNS Privacy server and you want to use Strict Privacy then you can specify this when starting the daemon in the following ways:
A quick test can be done by using dig on the loopback address
For getdns to re-send outgoing DNS queries over TLS the recursive resolvers configured on your machine must be changed to send all the local queries over the loopback interface on which getdns is listening. This depends on the operating system being run. It is useful to note your existing default nameservers before making this change!
Add the following (only add the IPv4 address if you don't have IPv6)
From the command line you can do the following to set the local DNS servers on, for example, your 'Wi-Fi' interface (first line clears all servers, second line adds localhost):
If you want to reset, use something similar to the above to specify your default servers.
Or via the GUI:
Once the change in step 1.6 is made your queries will be re-directed to the getdns daemon and sent over TLS! You can monitor the traffic using Wireshark watching on port 853.