NAT Bypass for End 2 End 'sensitive' applications

Document Type Expired Internet-Draft (individual)
Authors Alan O'Neill  , George Tsirtsis 
Last updated 1998-01-14
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This Internet-Draft is no longer active. A copy of the expired Internet-Draft can be found at


This document attempts to generate discussion on methods to run end 2 end 'sensitive' protocols and capabilities, like IPSEC, on networks that use Network Address Translators (NAT). The proposal does so by outlining one method to bypass NAT, when the required capabilities cannot be supported by NAT. The method uses a tunnel between a local host and the NAT box in order to dynamically allocate addresses to those hosts that need to communicate with external networks. With an allocated external address, the local hosts are able to communicate with external hosts without breaking the end 2 end principle. This proposal does not introduce any new protocols, it simply reuses existing protocols to provide an example solution.


Alan O'Neill (
George Tsirtsis (

(Note: The e-mail addresses provided for the authors of this Internet-Draft may no longer be valid.)