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NAT Traversal

Using NAT passthrough mode is an adequate solution when a single remote user located behind a NAT device needs secure access to an E-series router. However, NAT passthrough mode does not support secure access to the router by multiple remote users at locations such as hotels or airports where a NAT device resides between the router and the remote users. In addition, NAT passthrough mode does not provide secure access for groups of remote users at corporate locations where a NAT device resides between the company's intranet and the public IP network.

To allow secure router access for multiple remote hosts located behind a NAT device, the router supports a set of IETF standards collectively known as NAT Traversal (NAT-T). For a list of the individual standards that NAT-T comprises, see References .

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