VPN issue

Can any one tell me what exactly is nat-traversal. and where i can use it.
abey_vargheseAsked:
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myothwinCommented:
NAT-traversal is a solution for the common problem in TCP/IP networking of establishing connections between hosts in private TCP/IP networks which use NAT devices.

You can use peer to peer applications and VoIP. ( by using IPsec VPN client in order to have ESP packets pass through NAT.)
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VashooCommented:
Wikipedia is a good place to look.
http://en.wikipedia.org/wiki/NAT_Traversal
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