[as112-ops] Questions about AS112 Server Operators Listing

[William F. Maton Sotomayor]

On Tue, 17 Jan 2012, Xun Fan wrote:

> Our research group has been looking at assessing anycast usage.
> (We have a technical report about our early findings at
> ftp://ftp.isi.edu/isi-pubs/tr-671.pdf if you're interested.)

Interesting.

> Now we are testing our new method by sending
> DNS queries of name "hostname.as112.net" to a lot of open recursive name
> servers to
> find how many different AS112 nodes we can find in the Internet.
> We evaluate the results through the operators list at
> http://public.as112.net/node/10

Yes, I have some rudimentary form of raw data like this, quite incomplete, 
but the aim is to validate the list on ....

> We understand that the list is not complete, but as its last update was
> less than a month ago, we have two questions:
>
> 1. Does it mean that ALL the operators in the list (
> http://public.as112.net/node/10)
> were running AS112 service at the last update time (Dec 22nd, 2011)?

... whether this statement is actually true.  At this point, the list is 
cumulative:  In other words, unless we're told someone is no longer an 
operator, they remain on the list.  Hnece my reason for doing the scan and 
also for trying to map where the sinkholes are located in the Internet.

> 2. If not, does anyone know if the following operators in the list
> are still running AS112 service?
> - Abovenet Communications, Inc
> - Cogent Communications
> - Hurricane Electric
> - New Jersey International Internet Exchange, Inc
> - Teleglobe Inc.   (current owner seems to be Tata Communications)
> We have recursive name servers in these operators' IP block, but
> those recursive name servers led us to other AS112 nodes, so we
> suspect they might have turned off their AS112 nodes.

It's quite possible this is true, but only a careful trawling will confirm 
this.

wfms