Asus RT-n66u Port forwarding Nas

[vasilis90]

Hello everyone,
I am currently facing some issues with my network setup and I could use some help.
I am using dlink 320L as a home server and I need to set it so I can access it online.
My questions are:
• How do I go through the whole process from top to bottom?
• Is there a specific port I need to open up for the ftp server or I can put whichever I want?
• Next to the selection of the port in dlink I see this ( 1025 ~ 3688, 3690 ~ 49999, 65501 ~ 65535, Default: 21),why can’t I use for example port 150?(Don’t want to use 21 as I might need it later for flash disk in one of the usb ports on the asus router.
• Do I choose UTP or UDP and what’s the difference between them?

 

[lancer73]

No offence, but you sound as if you don't know how IP protocols work. Since the Internet is a hostile world, without the proper knowledge you might be better off not exposing your infrastructure to the outside world.

As an alternative you could use your Asus router as a VPN gateway. You can then connect with your VPN client from the outside world to your router. When the VPN is established you can access watherver service you have running on the inside.

See also: http://en.wikipedia.org/wiki/Point-to-Point_Tunneling_Protocol or http://openvpn.net/index.php/open-source/333-what-is-openvpn.html

As for you original question; FTP comes in many flavors, active, passive over UDP and TCP. By default FTP is active and over UDP. This means that you create an FTP session over port 21 (control channel) and that the server connects back to you over UDP (data channel).

This setup tends to break when you are behind a firewall at the remote site. That's why passive FTP was invented. The downside of this setup is that normally a whole range of ports has to be opened on the firewall.

http://www.crossftp.com/kb/entry/20/
http://en.wikipedia.org/wiki/File_Transfer_Protocol

On top of that, FTP is unencrypted, so your password might be compromised in transit.

For more secure options you can take a look at FTPS and SFTP. These are encrypted variants of FTP.

Does your DLink box also have the MyDLink service?
http://www.smallnetbuilder.com/cloud/cloud-devices/507-d-link-in-the-cloud-mydlink-reviewed