There are two types of DNS queries: iterative and recursive.
We do not allow recursive DNS to run on dedicated or Virtual Private Servers (VPS) unless it runs locally and for a specific IP range. If we find your server running an improper configuration of recursive DNS, we will exercise our right to suspend your account. The account will remain suspended until arrangements are made to turn off recursive DNS.
A DNS server that supports recursive resolution is vulnerable to DOS (denial of service) attacks, DNS cache poisoning, unauthorized use of resources, and root name server performance degradation.
For information on disabling recursive DNS, see the following: