bind

Availability and IPv6 support

Name	IPv6 support	Supported operating systems
bind	included	UNIX, *BSD, Linux
bind9	included	UNIX, *BSD, Linux

The Berkeley Internet Name Daemon, an implementation of DNS.

BIND 8 Features (comparing to Bind 4):

DNS Dynamic Updates (RFC 2136)
DNS Change Notification (RFC 1996)
Completely new configuration syntax
Flexible, categorized logging system
IP-address-based access control for queries, zone transfers, andv updates that may be specified on a zone-by-zone basis
More efficient zone transfers
Improved performance for servers with thousands of zones
The server no longer forks for outbound zone transfers
Many bug fixes
IPv6 transport support in the resolver (from KAME).

BIND version 9 is a major rewrite of nearly all aspects of the underlying BIND architecture. Some of the important features of BIND 9 are:

DNS Security
- DNSSEC (signed zones)
- TSIG (signed DNS requests)
IP version 6
- Answers DNS queries on IPv6 sockets
- IPv6 resource records (AAAA)
- Experimental IPv6 Resolver Library
DNS Protocol Enhancements
- IXFR, DDNS, Notify, EDNS0
- Improved standards conformance
Views
- One server process can provide multiple "views" of the DNS namespace, e.g. an "inside" view to certain clients, and an "outside" view to others.
Multiprocessor Support
Improved Portability Architecture