NAT (Network Address Translation) is a
technology most commonly used by firewalls and routers to
allow multiple devices on a LAN with private IP addresses
to share a single public IP address. NAT provides a long
list of advantages such as public IP address sharing,
greater local control, greater flexibility in ISP service,
increased security etc. However NAT poses an inherent
problem to many peer-to-peer protocols. NAT traversal
techniques are used to solve this problem. We have studied
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