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Many tools
that debug Internet connectivity,
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e.g. Ping,
TraceRoute, Protocol Analyzers,
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Router debug
commands e.t.c.
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Major
drawback – No ‘history’. Only works with
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the current
status and configuration
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Another
drawback – No perspective ‘mobility’
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(exception:
Looking Glasses, however, not all
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are available
to the public and they only
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provide
information about the AS where it’s
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installed)
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