"DNS64 is a mechanism for synthesizing AAAA records from A records. DNS64 is used with an IPv6/IPv4 translator to enable client-server communication between an IPv6-only client and an IPv4-only server, without requiring any changes to either the IPv6 or the IPv4 node"
Those of you with an interest in these features are invited to test out the following *pre-release*, specifically to let us know if the API is sufficient for your needs:
It can be compiled like any other PowerDNS Recursor release.
New in the version are the 'nodata()' and 'postresolve()' Lua hooks. Nodata functions just like nxdomain(), except that it gets called when a domain exists, but the requested type doesn't. This is where DNS64 happens.
Postresolve() is different, and very powerful - it gets handed the complete DNS answer as it would be sent out, ready for modification from Lua. This is where one might for example perform on the fly IP address renumbering.
Note: DO NOT TAKE THIS SCRIPT INTO PRODUCTION - it blacks out important sites
To get going without disturbing any existing nameservers on your computer, compile the PowerDNS Recursor, and start like this: $ ./pdns_recursor --local-address=0.0.0.0 --local-port=5300 --daemon=no --socket-dir=./ --lua-dns-script=powerdns-example-script.lua
Known defects are: postresolve() can't yet access the original dns rcode there is no way for nodata() to set the TTL to the SOA minimum value as specified by draft-ietf-behave-dns64
Please let us know your thoughts so we can make sure the API has everything needed for great DNS64 and renumbering operations!