Post 2.3 changes: * TCP and UDP now done by the same process/service (2.4.01) * upstream_servers now a full "dictionary" variable (2.4.02, 2.4.03) * Full DNS compression and decompression support (2.4.04) * RR rotation and TTL aging (2.4.05) * ip_blacklist support (2.4.06) * execfile support (2.4.07) * Merging multiple identical in-flight queries (2.4.07) * Deadwood 2.4 marked stable (2.4.08) * Default DNS servers are Google's DNS servers (2.4.09) * filter_rfc1918 parameter added (2.5.01) * infrastructure to process DNS packets from non-recursive servers (2.6.01) * non-glueless recursion (2.6.02) * NS glueless recursion (2.6.03) * Recursion with incomplete CNAME records (2.6.04) * Recursion with ANY records (2.6.05) * reject_aaaa ; feature-complete testing release (2.9.01) * stable release of fully recursive Deadwood (3.0.01)