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Keeping Track of a Mobile Intel AMT Platform

A management console application needs to keep track of the Intel AMT devices under its control. The platform IP addresses (one per interface for IPv4 addresses, possibly multiple IPv6 addresses per interface) and the fully-qualified domain name (FQDN) define the platform to the management console. The console application may perform IP discovery to locate all of the platforms containing Intel AMT. However, when a user takes a notebook computer from place to place within the enterprise, the FQDN remains the same, but the IP addresses may change as the user changes connections from one sub-net to another. The DHCP servers that issue IP addresses will register the platform to a DNS server, but an application looking for that platform using the FQDN may get an old IP address from a DNS cache.

There are two points to consider, then, when designing a management console:

   The FQDN of a platform will remain static even though the IP addresses may change. Therefore, it may be a more reliable identifier of the platform than the IP address.

   Cached DNS entries for mobile platforms may not be up-to-date.

Purging the DNS cache or shortening the time-to-live on DNS entries can reduce this problem.

Another approach is to configure Intel AMT to send an alert when the platform comes up (a link-up event). The console can use the source IP to do a reverse DNS look-up to relate the platform IP to its FQDN.

A third approach is to have a local agent inform the management console of any IP changes.

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