Dear all,
We have built a tool that checks the global visibility of IPv4 prefixes at the interdomain level.
The tool is available at http://visibility.it.uc3m.es/ and you can use it to retrieve the Limited Visibility Prefixes (LVPs) (i.e., prefixes that are not present in all the global routing tables we analyse) injected by a certain originating AS.
The query is very simple, it just requires to input the AS number for which you want to retrieve the originated LVPs, if any.
After checking the limited-visibility prefixes, we would appreciate any feedback that you can provide on the cause of the limited visibility.
Using a dataset from May 2nd 2013, we generated a list with the ASes which are originating LVPs: http://visibility.it.uc3m.es/fullASlist.html
We would like to hear from any operator who might find this project interesting, and, in particular, from these large contributors to the LVPs set.
Please note that advertising prefixes with limited visibility does not mean that the originating AS is necessarily doing something wrong.
The ASes might be generating the LVPs knowingly (e.g., scoped advertisements). However, there might be cases where the origin might be unaware that some prefixes are not globally visible (when they should) or that others are leaking as a consequence of mis-configurations.
Our purpose is to spread awareness about these latter phenomena, help eliminate the cause of unintended/accidental LVPs and upgrade this tool to an anomaly detection mechanism.
For more information on the definition and characteristics of a Limited Visibility prefix, please check the Frequently Asked Questions section of the webpage, available here: http://visibility.it.uc3m.es/Q_and_A_latest.html
The tool works with publicly available BGP routing data, retrieved from the RIPE NCC RIS and RouteViews Projects. The results are updated on a daily basis.
For more information on the methodology we refer you the RIPE labs article about the BGP Visibility Scanner, available here: https://labs.ripe.net/Members/andra_lutu/the-bgp-visibility-scanner
We are looking forward to your feedback!
Thank you, best regards,
Andra