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Reminder: Switch to Anycast IP address for DNS before 11/30/18

The University of Utah is making its Domain Name System (DNS) service more robust with a technology called Anycast. The Anycast Internet Protocol (IP) address 172.20.120.20 is available for U organizations to use. Several university organizations have already switched. 

IT administrators are asked to begin testing the IP address as soon as possible to identify and resolve potential issues, and migrate well in advance of November 30, 2018. Users and clients not pointing to the new DNS Anycast address as their DNS server will lose functionality after November 30. External DNS architecture and functionality will not be affected.

After November 30, 2018, 172.20.120.20 will be the only IP address providing UIT DNS services, and DNS services will be retired from these IP addresses:

  • Campus: 155.97.136.200, 155.101.246.200
  • Hospital: 155.100.144.200, 155.100.69.200, 155.100.108.5, 155.100.69.3

Anycast is a "shared" IP address not local to any specific DNS server, instead allowing multiple machines to share the same IP address. The move to a single Anycast brings the university in line with current DNS industry standards, and provides greater network reliability and redundancy for DNS. It's also part of broader effort by UIT's network team to get a better handle on available IP space across all devices, stabilize the university's IP address management environment, and open up disaster recovery capabilities.

If you have any questions, or would like guidance in testing a particular system with Anycast, your local IT support staff may be able to assist, or you may contact the UIT Help Desk at 801-581-4000 option 1.

Last Updated: 3/27/19