[SQU] how to block access

Hi,

I have the following situation: machines reconfigured by not authorized
users using IP number that is not in my DNS database.

Is there a way of making a dns test to see if this client is in my dns and
if not, forbidding it from access my squid server?

Thanks..
---------
Marilia Trevisan Stein
Administradora de Redes - UNISC
Fone/Fax: 51 717-7420 / 51 717-1855

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