Upgrade to Bind9.

[Brad Knowles]

At 11:25 AM -0300 6/25/01, Fabiano Reis wrote:

>  	I'm searching for a good reason to upgrade from bind
>  8.2.3 to bind 9.x
>
>  	Someone can list some reasons?

	BIND 8 is single-threaded, and does not answer queries during the 
start-up process.  BIND 9 is natively multi-threaded, and doesn't 
have this problem.

	Because BIND 8 is single-threaded, it cannot take advantage of 
multiple CPUs in a server.  Because BIND 9 is natively 
multi-threaded, it can take advantage of multiple CPUs.

	BIND 8 handles zone transfers through an external program, which 
may cause significant fork()/exec() overhead if used on the master. 
BIND 9 handles zone transfers internally, and does not have this 
problem.

	BIND 8 only partially supports some of the security and IPv6 
related extensions, while BIND 9 is the reference implementation for 
these features.

	Current benchmarks indicate that BIND 9.1.x may be slightly 
slower than BIND 8, but preliminary testing indicates that BIND 9.2.x 
should be at least as fast as BIND 8, and probably faster (especially 
on multiple CPU servers).

	BIND 8 is the last in a long line of hacks on top of hacks on top 
of hacks, whereas BIND 9 is a complete ground-up rewrite, using new 
programming methods that try to help ensure that the kind of security 
bugs you could have with the old version simply are not possible any 
more.


	That's about all I can think of, off the top of my head.  Do you need more?

-- 
Brad Knowles, <brad.knowles at skynet.be>

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