It seems as though you haven't followed some of the advice given you on
this list -- you'll have to do a bit more reading. Nevertheless:
> 1. How frequently DNS server will download the malware domain database
That depends on how frequently the RPZ provider publishes updates to the
zone. RPZ zones are normal master files: they are transferred with AXFR
and/or IXFR.
> 2. From where DNS server downloads the malware domains .. is it from SURBL
> webiste?
BIND slaves RPZ zones from the RPZ provider's servers. If you intend using this
one, then yes, from SURBL.
> 3. How to whitelist list of official/customer domains from RPZ query
> so that in case customer domain is listed in RPZ , business will not
> be affected?
If you followed the link in the article you mentioned [usual disclaimers
apply] you'll certainly have read that it is indeed possible to
whitelist domains in RPZ, but you'll need the as yet unrealeased BIND
9.9 code to do that.
-JP
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