Purified DNS

A DNS forward server offers correct results for both GFW polluted domains and CDN-enabled domains in China.

It does NOT rely on any domain/ip database (e.g. GFWlist, GeoIP etc), maintenance free, highly reliable.

With ruby >= 2.4.2 installed on your system, run the command below in your terminal(*nix) or CMD box:

gem install prdns

• local test purpose only: run 'prdns'
• local server: run 'prdns -l localhost'
• public server or for intranet: run 'prdns -l 0.0.0.0', or 'prdns -l 0.0.0.0 -l [::]' for both ipv4 & ipv6

Run `prdns -h' for more help

• linux-like: use of supervisord is recommended.
• macOS: use the plist file included in gem's lib dir as a template for launchd.

prdns does NOT support DoH nor DoT, so there are three choices for picking an authentic upstream DNS server (-a):

1. A DNS server outside GFW listen on port other than 53 (currently, only port 53 gets polluted);
2. There's a trustful route (via Shadowsocks/V2ray/Trojan, etc) accessing a DNS server outside GFW;
3. A local DNS forward server which supports DoH or DoT, configured with a DoH or DoT enabled upstream DNS server outside GFW.

Bug reports and pull requests are welcome on GitHub at https://github.com/arloan/prdns.