Port Forwarding on a PR-400KI

I found that I have the need to open a port in my router. (Port Forwarding)  Unfortunately, it’s the NTT router with a Japanese GUI and basically no English support that I have to do it on.  Well, I finally found a Japanese explanation that worked for me so I wanted to translate it and post it here.

Step 1: Log in to the GUI for the router.  In a web browser go to http://192.168.1.1 or http://ntt.setup.

Step 2: Go to the NAT settings:  Click on 詳細設定 (Advanced Settings) → 静的NAT設定 (Static NAT Settings)

Step 3: Click on an empty entry number (エントリ番号)

Step 4:  Fill in the details as follows:

優先順位 (Order of Precedence) = 1

接続インタフェース名 (Name of connection interface) = Should already be メインセッション (Main session)

宛先IPアドレス (Destination IP address) = 192.168.1.XX
(This is the IP address of the computer for which you want to open the port.  If you don’t know it, then open a command window and type ipconfig for Windows or ifconfig for Mac.  You may want to set that as static, so look around the web and find a tutorial for setting a static IP address on your system.)

変換対象IPアドレス (Target IP Address for conversion) = Keep it at 自分のWAN側IPアドレス
(Which means the WAN side IP address)

変換対象プロトコル (Conversion Protocol) = Keep at TCP

変換対象ポート(Port to be Forwarded) = Enter the port you wish to open

Step 5: Click the button on the left (設定) to save your changes.

You should now be able to go to canyouseeme.org and get a positive hit on that port.

You can also do a couple of really convenient things on this settings page in the router.  At the top of the page is the 1-touch settings area (ワンタッチ設定). Here you can easily open up some standard ports.

If, like me, you want to host your own server, you just click  the box next to this: Webサーバを外部に公開する (Open web server to outside)
Then enter your server’s IP address in the box next to this:  WebサーバのIPアドレス (Web server IP address)

If you want to use a file server, just tick the box next to this:  FTPサーバを外部に公開する (open FTP server to the outside)
Then enter your files server’s IP address in the box next to this:  FTPサーバのIPアドレス (FTP Server address)

And if you want to open up a DMZ to all packets, click the box next to this: (but beware the security warning!)

外部からのパケットをすべて特定ホストに中継する（簡易DMZ）[セキュリティに注意] (Pass all packets to and from a specified host)

Then enter the IP address for that specified host in the box next to this:  特定ホストのIPアドレス (Specified host’s IP address)

Well, I hope this helps somebody as much as finding this info helped me.