ToughNet NAT Router User's Manual
Network Address Translation
6-3
1-to-1 NAT Setting in TN-5916 for Consist 1
1-to-1 NAT Setting in TN-5916 for Consist 2
Enable/Disable NAT policy
Setting
Description
Factory Default
Enable or Disable
Enable or disable the selected NAT policy
None
NAT Mode
Setting
Description
Factory Default
N-1
1-1
Port Forward
Select the NAT types
None
LAN IP (1-1 NAT type)
Setting
Description
Factory Default
IP Address
Select the Internal IP address in LAN network area
None
WAN IP (1-1 NAT type)
Setting
Description
Factory Default
IP Address
Select the external IP address in WAN network area
None
NOTE
The ToughNet NAT Router can obtain an IP address via DHCP or PPPoE. However, if this dynamic IP address
is the same as the WAN IP for 1-to-1 NAT, then the 1-to-1 NAT function will not work. For this reason, we
recommend disabling the DHCP/PPPoE function when using the 1-to-1 NAT function.
N-to-1 NAT
If the user wants to hide the Internal IP address from users outside the LAN, the easiest way is to use the
N-to-1 (or N-1) NAT function. The N-1 NAT function replaces the source IP Address with an external IP address,
and adds a logical port number to identify the connection of this internal/external IP address. This function is
also called “Network Address Port Translation” (NAPT) or “IP Masquerading.”
The N-1 NAT function is a one-way connection from an internal secure area to an external non-secure area. The
user can initialize the connection from the internal to the external network, but may not be able to initialize the
connection from the external to the internal network.
