Solving The NAT Traversal Problem

Passmore, David
January 2006
Business Communications Review;Jan2006, Vol. 36 Issue 1, p15
Trade Publication
The article discusses the solutions to the problem created by network address translation (NAT) in voice-over-IP. Recently, Cisco and Microsoft announced that they would support a relatively new standard called Interactive Connectivity Establishment, which may help in solving NAT traversal problem. Four basic alternatives can be used to address NAT traversal, namely, application layer gateway, NAT control, change in protocol, and reuse of bindings. Application layer gateway is an application-specific proxy, or a simpler lower-level address translation function, resident in a NAT router or firewall. All NAT devices perform IP address translation and most also translate TCP or UDP ports, but only for the packet headers. With NAT control technique , devices behind a NAT can register with and signal a more intelligent NAT router or firewall to dynamically create the appropriate address and port number mappings. The most popular technique used for NAT control deployed today is Microsoft's Universal Plug and Play.


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