I'm having thousands of queries a domain isc.org and this increases my cpu percentage to 100%. That may be happening and how I can control this? is an attack? attachment of the log I made an update to version 9.9.2-P2 as recommended but still continuous problems.

[Kebba Foon]

On Tue, 2013-04-16 at 05:27 -0400, Barry Margolin wrote:
> In article <mailman.130.1366101804.20661.bind-users at lists.isc.org>,
>  Matus UHLAR - fantomas <uhlar at fantomas.sk> wrote:
> 
> > they apparently expect your nameserver to provide resursive DNS service for
> > your company while it may not be intended for that use...  some customers
> > (well, not only customers...) do not understand the difference between
> > authoritative and recursive DNS service and may try to use servers for
> > purpose not intended.  Some may also complain if the service does not work
> > properly
> 
> If they were using his server as a resolver, wouldn't he see queries for 
> lots of random hostnames (including popular domains like www.google.com, 
> www.yahoo.com, etc.), not just isc.org?
> 

These seems like some attack going on, after reading the mails i also
check my recursive server and found a lot of these in my logs:

16-Apr-2013 11:31:35.743 security: info: client 101.226.167.13#55818:
query (cache) 'xliar.com/A/IN' denied
16-Apr-2013 11:31:35.776 security: info: client 101.226.167.13#53710:
query (cache) 'www.baidu.com/A/IN' denied
16-Apr-2013 11:31:35.813 security: info: client 182.118.40.31#42505:
query (cache) 'www.baidu.com/A/IN' denied
16-Apr-2013 11:31:36.187 security: info: client 220.181.156.90#59278:
query (cache) 'hao.360.cn/A/IN' denied
16-Apr-2013 11:31:36.225 security: info: client 220.181.156.90#50194:
query (cache) 'www.360.cn/A/IN' denied
16-Apr-2013 11:31:36.253 security: info: client 220.181.156.90#33551:
query (cache) 'www.so.com/A/IN' denied
16-Apr-2013 11:31:36.574 security: info: client 182.118.40.31#36470:
query (cache) 'xliar.com/A/IN' denied
16-Apr-2013 11:31:36.587 security: info: client 182.118.40.31#51191:
query (cache) 'www.so.com/A/IN' denied
16-Apr-2013 11:31:36.691 security: info: client 117.21.187.20#47169:
query (cache) 'hao.360.cn/A/IN' denied
16-Apr-2013 11:31:36.705 security: info: client 183.60.211.65#32809:
query (cache) 'www.so.com/A/IN' denied
16-Apr-2013 11:31:36.722 security: info: client 117.21.187.20#54942:
query (cache) 'www.so.com/A/IN' denied
16-Apr-2013 11:31:36.733 security: info: client 117.21.187.20#50493:
query (cache) 'down.360.cn/A/IN' denied
16-Apr-2013 11:31:36.761 security: info: client 182.118.40.31#54391:
query (cache) 'hao.360.cn/A/IN' denied
16-Apr-2013 11:31:36.762 security: info: client 120.128.6.42#56439:
query (cache) 'down.360.cn/A/IN' denied
16-Apr-2013 11:31:36.798 security: info: client 120.128.6.42#52172:
query (cache) 'www.360.cn/A/IN' denied

my server is not an open recursive server its only open to my clients
and these are not even from my country.

Kebba