Dear all, We have built a tool that checks the 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 (we provide a form with a few very short questions which you could fill in and submit). 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 AS might be unaware that some prefixes are not globally visible (when they should) or that others are leaking as a consequence of mis-configurations/slips. 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 to the slides of the NANOG57 presentation about the BGP Visibility Scanner: http://www.nanog.org/meetings/nanog57/presentations/Wednesday/wed.general.Lu... Also, you can check 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
Hi Jason, Thank you for your email! We are glad to hear that you like the work! At the moment, you can only query the webpage and retrieve the LVPs per origin AS. We haven't yet considered giving the option of downloading the complete report. We are now working on a new version of the tool, and we will try to integrate your suggestion, thank you! If you have any other suggestions or requests, don't hesitate to let us know! Best regards, Andra On 05/15/2013 03:00 PM, Jason Hellenthal wrote:
On 5/15/13 3:00 PM, Jason Hellenthal wrote: prefix. If you are happy to do your own post-processing, set your own boundaries on what to consider limited visibility prefixes, have a look at the IPv4 and IPv6 table dumps at http://www.ris.ripe.net/dumps/ Note that the fact that not all RIS peers give us a full BGP table blurs the counts somewhat. Prefixes which are globally visible may (today) have anywhere between 96 and 110 peers announcing the prefix to the RIS route collectors. -- Rene
participants (3)
-
Andra Lutu -
Jason Hellenthal -
Rene Wilhelm