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DVG-1120M ATA is also a firewall and therefore blocks all incoming traffic for externally initiated requests. As such, if you have any applications/servers on the DVG's LAN, you will have to set port forwarding on the DVG (below), or other routers connected to the WAN side of your ATA.
Note that since this applies only to requests initiated from the Internet, if you are FTPing from your computer, there are no ports to open since the request is initiated from within your LAN. However, if you want to FTP to your computer from an external site, you need to "forward" ports as noted below.
DVG Port Forwarding
Port forwarding allows traffic on a specific port to be passed on. This is handy if you need to access your LAN from a remote location or you want to set up an ftp server.
You should setup a FIXED LAN IP for the computer(s)/server(s) you are forwarding to from the DVG. Note that this address will be determined by the DVG'S LAN IP address which by default is 192.168.15.1 (i.e. Your computer/server can have an address of 192.168.15.2).
Alternatively, you can set a DHCP address range of "one" (1) to force a fixed DHCP address for the device connected to the Ethernet port.
After signing onto the DVG, you need to go to NAT Configuration, and then Local Server Configuration to access the screens for setting up port forwarding.
There are only 6 slots, so if you need to open up TCP and UDP simultaneously for a particular port, then you'll have even fewer left for additional ports.
If you're a heavy BT user then good luck!
An example by Kenmo:
I have the following port forwarding setup working: