Why so different versions for Bind9 exist?

[Mark Andrews]

> Hello ISC Admins
> I`m new worker on bind.
> I want to know what are the main differences between types of Bind9
> versions?
> why so different versions exist for bind 9
> ie 9.3.x-9.4.x-9.5.x? and ISC updates each of them separately?
> why isc doesnt relaese one version for example Bind 9.1, 9.2,
> 9.3 ,...and increase one number after bind for newer version?
> and the main question is, what are the important options that we must
> consider for selecting which version of bind9 is useful for us?
> bind 9.3.x
> bind 9.4.x
> bind 9.5.x
> any idea would be appreciated
> Regards
> 

	BIND 9.X.Y
		X indicates a feature set.
		Y is maintenance level.

	You should be able to go from version of 9.3.x to another
	version of 9.3.x without having to change your configuration.
	Similarly 9.4.x and 9.5.x.
	The one exception is if there has been a security fix that
	required a configuration change.

	BIND 9.[X-2] goes to EOL 6 months after the release of BIND 9.X.

	Mark
-- 
Mark Andrews, ISC
1 Seymour St., Dundas Valley, NSW 2117, Australia
PHONE: +61 2 9871 4742                 INTERNET: Mark_Andrews at isc.org