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CODO: firewall traversal by cooperative on-demand opening

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3 Author(s)
Sechang Son ; Comput. Sci. Dept., Wisconsin Univ., Madison, WI, USA ; B. Allcock ; M. Livny

Firewalls and network address translators (NATs) cause significant connectivity problems along with benefits such as network protection and easy address planning. Connectivity problems make nodes separated by a firewall/NAT unable to communicate with each other. Due to the bidirectional and multi-organizational nature of grids, they are particularly susceptible to connectivity problems. These problems make collaboration difficult or impossible and cause resources to be wasted. This paper presents a system, called CODO, which provides applications end-to-end connectivity over firewalls/NATs in a secure way. CODO allows applications authorized through strong security mechanisms to traverse firewalls/NATs, while blocking unauthorized applications. This paper also formalizes the firewall/NAT traversal problem and clarifies how a traversal system fits in the overall security policy enforcement by a firewall/NAT.

Published in:

HPDC-14. Proceedings. 14th IEEE International Symposium on High Performance Distributed Computing, 2005.

Date of Conference:

24-27 July 2005