Iowa State University

ITInformation Technology

Off-Campus Users Disabled from Recursive DNS Queries

This news item expired June 16, 2013. It may contain out-of-date information.

For security and compliance purposes, ITS is taking several steps regarding recursive Domain Name System (DNS) queries.

DNS service is used by all computers on the internet and translates a name, such as, into an IP address that uniquely identifies each internet-connected computer. Historically ISU's recursive DNS service has been available to and used by on- and off-campus users. Unfortunately, name servers are being used in attacks, and ISU has already been an unwitting participant in attacks against an off-campus site.

ITS implemented several solutions include blocking off-campus access to this service, effective June 3. When an off-campus computer attempts to connect, the server will redirect them to a web page letting them know they need to contact their ISP for help in correctly configuring their DNS settings.

Contact the ISU Solution Center at 515-294-4000 or

solution (at) iastate (dot) edu
if you have questions about this change.