Roma Tre University presents three analyses related to the recent events in Egypt, proving interesting behavior in relation to the observed disconnection. We use tools like BGPlay and iBGPlay, developed for the visualisation of BGP dynamics.
As media and tech articles reported, many Egyptian networks disappeared from the Internet during the night between 27 - 28 January 2011. However, a significant number of networks and services managed to remain visible and/or active. In this article we present three interesting examples, showing the insight we can get using our visualisation tools BGPlay and iBGPlay.
Egyptian Universities Network
The first example features BGP data from GARR . GARR provides connectivity to our university and hosts an instance of iBGPlay to monitor the reachability of selected targets. Looking at various examples of Egyptian networks disappearing from the network, we find out that before 30 January 2011, the Egyptian academic network (AS2561) is apparently visible through GÉANT :
However, during the same time window none of the prefixes were actually reachable from our network (via ping, traceroute, etc,) which suggests an underlying discrepancy between BGP tables and real connectivity .
The disruption causes major rerouting towards AS6762, owned by Telecom Italia:
The American University in Cairo
The last example deals with multihoming, which proves its value in avoiding single points of failure. The IP prefix (188.8.131.52/24) is announced by AS8524, owned by the American University in Cairo, and is used to publicly serve their website. As the Hurricane Electric BGP Toolkit shows , AS8524 peers with at least two ISPs, namely RAYA Telecom and Noor Data Networks. This is what REX tells us about the set of prefixes announced by AS8524:
The mixed pattern of disappearing and visible prefixes reflects Richard Barnes' observations : RAYA fades out after 27 January whereas Noor Data Networks remains temporarily active (BGPlay gives visual evidence for each prefix). The plot draws our attention to the prefix mentioned above (184.108.40.206/24), which becomes visible again after being withdrawn for some time. Using BGPlay, we show what this means in terms of BGP policies. The routing graph before 27 January looks as follows:
The prefix was routed through RAYA. The situation changed after 29 January:
What we see is a clear shift to Noor Data Networks (visually represented by different colors in the timeline on the left) in order to ensure reachability of the service . Note that according to REX, this is the only prefix affected by the policy change, implicitly stating its relative importance within the whole set of prefixes announced by AS8524.
Authors and Acknowledgements
RIPE Labs article by Claudio Squarcella.
 GARR is the Italian Research & Education Network (NREN). It plans and operates the national high-speed telecommunication network for University and Scientific Research. Its shareholders are four major Research and Academic organizations in Italy, CNR, ENEA, INFN and Fondazione CRUI, representing the Conference of Italian University Rectors. For more info visit http://www.garr.it/
 The GÉANT network is the fast and reliable pan-European communications infrastructure serving Europe’s research and education community. Co-funded by European National Research & Education Networks (NRENs) and the EC, the GÉANT network and project (also known as GN3) is entering its third generation, along with associated development activities. For more info visit http://www.geant.net/
 EUMEDCONNECT2 is a high-capacity IP-based data-communications network serving the research and education communities in seven countries across the southern Mediterranean, enabling them to participate in collaborative projects. Offering a direct link to GÉANT, its pan-European counterpart, EUMEDCONNECT2 allows approximately 2 million users in around 700 institutions across North Africa and the Middle East to collaborate with their peers at more than 4000 research and education establishments in Europe. For more info visit http://www.eumedconnect2.net/