Routing hijack attacks have plagued the Internet for decades.Internet-wide BGP monitoring infrastructures have recently received great attention as they promise to quickly detect hijack attacks and, ultimately, mitigate them.

In this poster, we investigate the robustness of monitor based detection systems with respect to so-called “smart”attackers who engineer their hijacks to evade detection. Our preliminary simulations show that monitor-based systemsmay be unable to detect many carefully crafted hijacks diverting traffic from thousands of ASes.