Sending extra info in bind dns query packet

Karl Auer kauer at
Thu Jul 14 13:15:03 UTC 2016

On Thu, 2016-07-14 at 11:19 +0530, Sachin Patil wrote:
> I am just looking into bind and want to send extra information while
> querying dns bind server. This information will be used at the bind 
> server side to return the resolved ip.

I've had an off-list discussion with Sachin Patel, asking him what he
was actually trying to achieve. It turns out that it is this:

"I am just trying to fiddle with dns server to block certain users to
certain resources."

I have suggested that he look for solutions to *that* problem, rather
than starting by modifying BIND.

That said, there may be ways to use the DNS to achieve what he needs,
and this is not such a bad place to ask for pointers in that direction.

Is it?

Regards, K.

Karl Auer (kauer at

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