[AusNOG] An Outage in January affecting Optus Blocks

[Dobbins, Roland]

On Aug 4, 2011, at 12:45 PM, Lin Quan wrote:

> We are working on a research project to infer network outages from IPv4 pings.

As an FYI, this isn't actually a valid methodology to use in order to infer network outages.  There's a lot of literature and previous art on this topic, and one of the basic principles which has emerged based on experience over time is that ping isn't a reliable way to make these sorts of determinations.

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Roland Dobbins <rdobbins at arbor.net> // <http://www.arbornetworks.com>

		The basis of optimism is sheer terror.

			  -- Oscar Wilde