SETUP
DOC_DEV_Router setup guide_A
page 41
9
Substitution of addresses (NAT, Port forwarding, Advance NAT)
9.1
Network address translation (NAT)
That function applies to the IP frames issued by devices belonging to the LAN network and transmitted to
the WAN network.
The NAT function consist in replacing the source IP address of that frames by the source IP address of the
Router on the WAN interface.
That function is required when a device belonging to the LAN network must connect to the internet (to
transmit a file with FTP for instance).
To enable the NAT function,
•
Select Set-up>WAN interface>
•
Select the « Enable address translation » checkbox.
9.2
Port forwarding
9.2.1
Overview
Port forwarding consists in transferring IP frames intended for the IP router WAN interface to a particular
device of the LAN interface using the destination port number.
The transfer criteria is the port number; the port number is used as an additional destination address field.
Example :
Let us suppose the PC named “W1” connected to the
WAN network has to send frames to the device PLC1
connected to one Ethernet port of the Router.
If routing tables cannot be registered nor a VPN, the solution can be to use the Port forwarding function :
When W1 needs to transmit frames to PLC1, it transits the frames to the Router on a particular port number.
The Router checks the frame, replaces the destination address by the IP address of the device on the LAN
interface, and eventually changes the port number.
PLC1 192.168.0.15
TCP : 102
PLC2 192.168.0.16
TCP : 502
PC 192.168.0.17
TCP : 80
62.10.10.7
TCP : 102
adr IP Internet :
62.10.10.7
Internet
W1
Réseau IP
Summary of Contents for RAS Series
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