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Off-campus recursive DNS access to be disabled

On Wednesday, May 29, 2013, SCS Domain Name Servers (DNS) will no longer accept recursive DNS queries from off campus. This change is necessary in order to prevent our DNS servers from being used in denial of service (DoS) attacks on third-party networks by persons outside of Carnegie Mellon.

Users Impacted: Users who have specifically configured their off campus computer or router to use SCS DNS servers for all domain name lookups.

How can I tell if my computer may be affected?

Off campus computers that have been specifically configured to use SCS DNS servers for all domain name lookups will be impacted by this change.

Computers that will not be affected:

Machines supported by SCS Computing Facilities will not be affected by this change. These settings are the defaults in current versions of Windows, MacOS X, and all major Linux distributions. This change will also have no effect for machines located on Carnegie Mellon's network, even if not properly configured.

Note: This change has no effect for machines which are properly set to obtain DNS server configuration from DHCP servers, or which run full-service resolvers which do not depend on an external cache.

Please contact the SCS Help Desk at x8-4231 or send mail to if you have any questions regarding this change.