ETIC SIG, User Manual, Page: 38 / 83

CONFIGURATION
Page 38
User’s guide ref 9017409-01 SIG Router & VPN server
To enable RIP,
•
select the « Set up » menu, the “Routing” menu and then the “RIP”
menu».
•
Select the ‘
Enable RIP on LAN interface” and the “Enable RIP on WAN
interface” options.
9 Address and port translation
The SIG provides the capability to replace the original source IP address
and the destination port and IP address in particular situations.
9.1 Port forwarding
The port forwarding function consists in transferring to a particular
device connected to the LAN interface a particular data flow addressed
to the SIG router on its WAN interface.
That function applies only to the frames addressed to the WAN IP
address of the router.
The transfer criteria is the port number; the port number is used as an
additional address field.
When a frame is addressed to the SIG router with a particular registered
port, it is transferred to a particular device connected to the LAN
interface.
Example :
Let us suppose the PC named “W1” of the WAN network has to send
frames to the device PLC1 of the LAN network
Suppose moreover that the addresses of the LAN network cannot be
used on the WAN network for any reason.
The solution can be to use the Port forwarding function :
When W1 needs to transmit frames to PLC1, it addresses the frames to
the SIG router on a chosen and agreed port.
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.