Source Prefix Filtering in ROFL

Technical reports:

Title:: Source Prefix Filtering in ROFL
Author(s):: Zhao, Hang
Johnson, Maritza Lupe
Chau, Chi-Kin
Bellovin, Steven Michael
Date:: 2009
Type:: Technical reports
Department:: Computer Science
Permanent URL:: http://hdl.handle.net/10022/AC:P:9283
Series:: Columbia University Computer Science Technical Reports
Part Number:: CUCS-033-09
Publisher:: Department of Computer Science, Columbia University
Publisher Location:: New York
Abstract:: Traditional firewalls have the ability to allow or block traffic based on source address as well as destination address and port number. Our original ROFL scheme implements firewalling by layering it on top of routing; however, the original proposal focused just on destination address and port number. Doing route selection based in part on source addresses is a form of policy routing, which has started to receive increased amounts of attention. In this paper, we extend the original ROFL (ROuting as the Firewall Layer) scheme by including source prefix constraints in route announcement. We present algorithms for route propagation and packet forwarding, and demonstrate the correctness of these algorithms using rigorous proofs. The new scheme not only accomplishes the complete set of filtering functionality provided by traditional firewalls, but also introduces a new direction for policy routing.
Subject(s):: Computer science