<div><div><div><div>Dear AUSNOG folks,</div><div><br></div><div>We are working on a research project to infer network outages from IPv4</div><div>pings.</div><div><br></div><div>In one of our ping windows from 2011-01-27 to 2011-02-10, we observed</div>
<div>an outage in the following prefixes, which are down for several days,</div><div>from 2011-01-27 (observation starting time) to 2011-02-03.</div><div><br></div><div><br></div><div>AS# | Prefix (/24) | Description </div>
<div>4804 | 49.177.128.0 | MPX-AS Microplex PTY LTD</div><div>4804 | 49.178.142.0 | MPX-AS Microplex PTY LTD</div><div>4804 | 49.178.202.0 | MPX-AS Microplex PTY LTD</div><div>4804 | 49.178.224.0 | MPX-AS Microplex PTY LTD</div>
<div>4804 | 49.178.250.0 | MPX-AS Microplex PTY LTD</div><div>4804 | 49.181.143.0 | MPX-AS Microplex PTY LTD</div><div>4804 | 49.181.219.0 | MPX-AS Microplex PTY LTD</div><div>4804 | 49.191.253.0 | MPX-AS Microplex PTY LTD</div>
<div>4804 | 49.192.9.0 | MPX-AS Microplex PTY LTD</div><div>4804 | 49.193.101.0 | MPX-AS Microplex PTY LTD</div><div>4804 | 49.193.105.0 | MPX-AS Microplex PTY LTD</div><div>4804 | 49.193.93.0 | MPX-AS Microplex PTY LTD</div>
<div>4804 | 49.197.20.0 | MPX-AS Microplex PTY LTD</div><div>4804 | 49.199.138.0 | MPX-AS Microplex PTY LTD</div><div>4804 | 49.199.197.0 | MPX-AS Microplex PTY LTD</div><div><br></div><div><br></div>
<div>We are sure of the recovery time of these prefixes, but not sure</div><div>about the down time since the outage could happen well before our</div><div>observation starts.</div><div><br></div><div>We believe these prefixes are affiliated with OPTUS, does anyone have</div>
<div>any clue about the reasons for this outage?</div></div></div></div><div><br></div><div><br></div><div><div>Thanks for your help,</div><div><br></div><div>Lin Quan</div><div>USC/Information Sciences Institue</div><div>
4676 Admiralty Way, Marina del Rey, CA 90292</div></div><div><br></div>