Spectroscopy of private DNS update sources

We study attempts to dynamically update DNS records for private (RFC1918) addresses, by analyzing the frequency spectrum of updates observed at an authoritative nameserver for these addresses. We developed a binary autocorrelation algorithm and discovered that updates come in infinite series with periods of 60 or 75 minutes. We identify both periods as default settings of out-of-the-box Microsoft Windows 2000 and XP DNS software. Identifying this common property of end-user environments helps to understand users' behavior on the Internet. To our knowledge this is the first study of the global impact of dynamic DNS.

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