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Old 02-25-2009, 12:23 PM
Paul R. Coen's Avatar
Paul R. Coen Paul R. Coen is offline
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Join Date: Jun 2005
Location: Madison, NJ
Posts: 140
Default Network interruption, February 25th

We had a brief service interruption starting this morning around 10:20. The underlying problem was fixed a few minutes later.

Unfortunately, the cause of that problem (an error in a network access control list, or ACL that was being put in place to improve security in response to a documented vulnerability) triggered unexpected behavior in our VMware environment. Some VMware virtual servers (guests) shut down and restarted, including the servers that provide DNS (domain name services), which map names (www.drew.edu, or www.google.com, for example) to IP addresses. Without the ability to resolve names, services were unreachable.

The majority of our nearly 100 virtual servers continued to run, but were unreachable due to the unavailability of DNS and our network load balancing server.

Some PCs on campus may have lost their IP address if they were rebooted. An additional reboot should solve that issue.

The problem with the ACL has been resolved. In addition, we've made configuration changes to the VMware server cluster to prevent a repeat of this behavior.
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