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Wikipedia is a good place to look.<br />
<a href="http://en.wikipedia.org/wiki/NAT_Traversal" rel="ugc">http://en.wikipedia.org/wiki/NAT_Traversal</a>
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Wikipedia is a good place to look.
http://en.wikipedia.org/wiki/NAT_Traversal [http://en.wikipedia.org/wiki/NAT_Traversal]

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Can any one tell me what exactly is nat-traversal. and where i can use it.
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Can any one tell me what exactly is nat-traversal. and where i can use it.

VPN issue

Networking is the process of connecting computing devices, peripherals and terminals together through a system that uses wiring, cabling or radio waves that enable their users to communicate, share information and interact over distances. Often associated are issues regarding operating systems, hardware and equipment, cloud and virtual networking, protocols, architecture, storage and management.

Networking

Hardware-based firewalls provide more sophisticated protection for inbound and outbound traffic than the simple Windows software firewall or the basic NAT firewalls found in routers. These devices implement techniques such as stateful packet inspection, deep packet inspection, and content filtering; and may include built-in antivirus and anti-malware protection.

Hardware Firewalls

Internet Protocol Security (IPsec) is a protocol suite for secure Internet Protocol (IP) communications by authenticating and encrypting each IP packet of a communication session. IPsec includes protocols for establishing mutual authentication between agents at the beginning of the session and negotiation of cryptographic keys to be used during the session. IPsec can be used in protecting data flows between a pair of hosts (host-to-host), between a pair of security gateways (network-to-network), or between a security gateway and a host (network-to-host). IPsec is an end-to-end security scheme operating in the Internet Layer of the Internet Protocol Suite.