Bogons are network prefixes that should never appear in the Internet routing table. These networks are commonly used by miscreants for spam and DDoS attacks, and therefore filtering bogons at your perimeter is generally considered useful. However, these filters must be maintained as the list of unallocated subnets (bogons) changes from time to time.

Team Cymru offers a variety of resources to help you maintain your filters, including the Bogon Route Server Project, which can automatically filter bogons on your routers via an eBGP peering session with us. This presentation will give you an overview of options available for automated filtering of bogons within your network.

About the Presenter
Dave Deitrich <deitrich@cymru.com> is a full-time member of Team Cymru and an employee of Cisco Systems. Prior to this he worked for Motorola, IBM, and Computer Sciences Corporation as a network architect, engineer, and troubleshooter. Dave has always had a strong interest in new methods of collection, analysis, and presentation of network performance data. Note that Dave is not related to Dave Dittrich of the University of Washington!