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Enabling NAT (Windows Embedded CE 6.0)

1/6/2010

The following steps show how to enable NAT for a Windows Embedded CE-based device using IPv4.

To enable NAT

  1. Enable IP forwarding by setting the HKEY_LOCAL_MACHINE\Comm\Tcpip\Parms\IpEnableRouter registry key equal to 1.

  2. Set the HKEY_LOCAL_MACHINE\Comm\ConnectionSharing\EnableAddressTranslation registry key equal to a non-zero value.

  3. Set the HKEY_LOCAL_MACHINE\Comm\ConnectionSharing\PublicInterface registry key to the public interface on which you want to enable NAT. This value should contain a string that indicates the adapter instance for a network card, or that indicates the RAS connection name for a dial-up connection.

NAT mappings expire after a certain amount of time if the mappings are not used. The default expiration time is 24 hours for TCP connections, and 1 minute for UDP mappings. You can configure these expiration times by setting registry subkeys contained under the HKEY_LOCAL_MACHINE\Comm\IPNat registry key.

The following table shows optional registry subkeys that you can use to configure these expiration times.

Subkey Description

TCPTimeoutSeconds_

Specifies the amount of time before TCP mappings expire in the NAT, if the mappings are not used.

UDPTimeoutSeconds

Specifies the amount of time before UDP mappings expire in the NAT, if the mappings are not used.

See Also

Concepts

Network Address Translation