Sam Varshavchik wrote:
Rodrigo Severo writes:
Does anybody knows of any suitable solution for this issue besides
bind? I want by all means not to go back using bind if at all possible.
Fortunately or unfortunately, bind is the only battle-tested DNS
server in existence.
I have just installed bind version 9.2.5. Testing the answers of several
repeated queries to this local-caching-only-forwarder-bind the results
didn't look random at all (despite being different one from the other)
so I looked at bind's documentation. At the end of section 6.2.14.12 I
found this:
"BIND 9 currently supports only a "random-cyclic" ordering, where the
server randomly chooses a starting point within the RRset and returns
the records in order starting at that point, wrapping around the end of
the RRset if necessary."
which is a pretty good description of the kind of pseudo-randomness I'm
getting from bind9. I am not looking for true perfect randomness. Not at
all. My point is that the randomness argorithim bind is using makes
almost all answers for a 10 MXs with 2 top MXs have the same order. In
fact I believe it makes 90% of them to have the same order.
At ISC's main page <http://www.isc.org> there is a fat warning of the
"Hot Topics" section: " BIND4 <http://www.isc.org/sw/bind/bind4.php> /
BIND8 <http://www.isc.org/sw/bind/bind8.php> *Unsuitable for Forwarder
Use*". So no luck here also.
So I have to ask again, what should I do to get some reasonable
randomness in Courier's MX choosing strategy?
Thanks again for any pointers,
Rodrigo Severo
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