To maintain security, the University of Tsukuba restricts communication from devices connected to subnetworks which are set as a client zone.
For more details on this measure, please refer to the following webpage:
Internet Security Management
All PCs in Zengaku Computer System’s satellite computer rooms are connected to subnetworks set as a client zone. However, DNS queries from the PCs are sent to the full-service resolver without such restriction, which makes it possible for malware to send DNS queries to search for its website name. To solve this issue, ACCC will be restricting malware communication to the full-service resolver from the date below:
Implementation Date: Monday, March 11, 2019
Thanks to this measure, even if some PC sends DNS queries to search for a malware website, the communication will fail automatically.