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Negotiation of Nat-Traversal in the Ike

By Kivinen, T.

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Book Id: WPLBN0000693680
Format Type: PDF eBook
File Size: 35.78 KB.
Reproduction Date: 2005
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Title: Negotiation of Nat-Traversal in the Ike  
Author: Kivinen, T.
Volume:
Language: English
Subject: Social Psychology, Language
Collections: Technical eBooks Collection
Historic
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Kivinen, T. (n.d.). Negotiation of Nat-Traversal in the Ike. Retrieved from http://www.worldebooklibrary.net/


Description
Technical Reference Publication

Excerpt
Introduction: This document is split into two parts. The first describes what is needed in IKE Phase 1 for NAT-Traversal support. This includes detecting whether the other end supports NAT-Traversal, and detecting whether there is one or more NATs between the peers. The second part describes how to negotiate the use of UDP encapsulated IPsec packets in IKE's Quick Mode. It also describes how to transmit the original source and destination addresses to the peer, if required. These addresses are used in transport mode to update the TCP/IP checksums incrementally so that they will match after the NAT transform. (The NAT cannot do this, because the TCP/IP checksum is inside the UDP encapsulated IPsec packet.)...

Table of Contents
Table of Contents 1. Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . 2 2. Specification of Requirements . . . . . . . . . . . . . . . . . 3 3. Phase 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 3.1. Detecting Support of NAT-Traversal. . . . . . . . . . . . 4 3.2. Detecting the Presence of NAT . . . . . . . . . . . . . . 4 4. Changing to New Ports . . . . . . . . . . . . . . . . . . . . . 6 5. Quick Mode. . . . . . . . . . . . . . . . . . . . . . . . . . . 8 5.1. Negotiation of the NAT-Traversal Encapsulation. . . . . . 9 5.2. Sending the Original Source and Destination Addresses . . 9 6. Initial Contact Notifications. . . . . . . . . . . . . . . . . 11 7. Recovering from the Expiring NAT Mappings. . . . . . . . . . . 11 8. Security Considerations. . . . . . . . . . . . . . . . . . . . 12 9. IANA Considerations. . . . . . . . . . . . . . . . . . . . . . 13 10. IAB Considerations . . . . . . . . . . . . . . . . . . . . . . 14 11. Acknowledgments. . . . . . . . . . . . . . . . . . . . . . . . 14 12. References . . . . . . . . . . . . . . . . . . . . . . . . . . 14 12.1. Normative References . . . . . . . . . . . . . . . . . . 14 12.2. Informative References . . . . . . . . . . . . . . . . . 14 Authors' Addresses . . . . . . . . . . . . . . . . . . . . . . . . 15 Full Copyright Statement . . . . . . . . . . . . . . . . . . . . . 16

 

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