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It classified NAT implementations as full-cone NAT, (address) restricted-cone NAT, port-restricted cone NAT or symmetric NAT, and proposed a methodology for testing a device accordingly. However, these procedures have since been deprecated from standards status, as the methods are inadequate to correctly assess many devices.
NAT is NOT what provides the security in this case, and, a stateful IPv6 firewall can easily have a default deny policy for incoming sessions without the breakage caused by NAT. NAT is unnecessary except for address shortages, or, extraordinary circumstances such as a desire/need to present a network as an artificially different prefix.
It is a tool among other methods and it is a tool for other protocols in dealing with NAT traversal, most notably Traversal Using Relay NAT (TURN) and Interactive Connectivity Establishment (ICE). STUN works with three types of NAT: full cone NAT, restricted cone NAT, and port restricted cone NAT. In the cases of restricted cone or port ...
Teredo is not compatible with all NAT devices. Using the terminology of RFC 3489, it supports full cone, restricted, and port-restricted NAT devices, but does not support symmetric NATs. The Shipworm specification [6] original that led to the final Teredo protocol also supported symmetric NATs, but dropped that due to security concerns.
NAT categorization according to RFC 3489: Date: 5 November 2006: Source: Own work: Author: Christoph Sommer: Permission (Reusing this file) Own work, copyleft: Multi-license with GFDL and Creative Commons CC-BY-SA-2.5 and older versions (2.0 and 1.0)
In Windows XP, NAT traversal is enabled by default, but in Windows XP with Service Pack 2 it has been disabled by default for the case when the VPN server is also behind a NAT device, because of a rare and controversial security issue. [6] IPsec NAT-T patches are also available for Windows 2000, Windows NT and Windows 98. [citation needed]
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Once both NAT's have those tuples added, then "holes" have been "punched" in the NATs, allowing both hosts to directly communicate. If both hosts have Restricted cone NATs or Symmetric NATs, the external NAT ports will differ from those used with S. On some routers, the external ports are picked sequentially, making it possible to establish a ...