How to setup FTP server behind Router?

I have a FileTransferProtocol server so want to set it up so that I can use my global ip instead of my router IP. How can I do that?

First of all, I will recommend you to Serv-U as a FTP Server

After downloading and installing Serv-U FTP Server it should start the FTP setup wizard to guide you through the initial setup.

Here are the questions the setup wizard will ask you:
1. Press “next” to proceed or “cancel” to skip the setup wizard - Click next to begin
2. Enable small images with the menu items? - up to you
3. Press “next” to start the Local FTP server and connect to it - click next
4. IP address [leave blank for dynamic or unknown IP]
5. Domain name - Enter the domain name you want.
6. Install as a system service? - Your choice
7. Allow anonymous access? - Your choice
8. Create named account? - create an account
9. Account login name:- Enter a login name you want for the account
10. Password - Enter a password you want for the account.
11. Home directory - specify the directory on where you will place your files for downloading.
12. Lock the user in to the home directory? - Your choice
13. Account admin privilege - Your choice
14. Press “finish” to proceed or “previous” to make changes - Press finish.

By following above instructions you are done with the initial setup of FTP server

Once you have installed FTP server, you have to assign a Static IP address to it.
To do this,
Right click “My Network Places” and choose “Properties”.
This will open the “Network and Dial-up Connections” window.

Right click “Local Area Connection” and choose “Properties”.
This will open the “Local Area Connection Properties” window

Choose “Internet Protocol (TCP/IP)” and click the properties button.
Check the radio button “Use the following IP Address” and enter an IP address that is not in use. If you are going to run the DHCP server on the router I suggest using something like 192.168.0.100 as this is not within the DHCP pool so you should not have any conflicts.
If you are going to disable the DHCP server in your router you can
Assign your machine any IP address between 192.168.0.2 and 192.168.0.254

The Subnet mask will be 255.255.255.0
The Default gateway will be 192.168.0.1
The Preferred DNS server will be 192.168.0.1

To setup FTP Server behind Router, you need to forward ports from router to the FTP server.

• Log into your router using a web browser by typing “192.168.0.1” into the address bar. This should bring up a login screen by default the user name is “admin” and the password is “1234” unless you have changed this.
  
• Login and choose the “Advanced” option on the left side of the screen.
  
• Choose the Ports option, which will bring up the Port Forwarding screen.

For Server IP Address enter the IP address of your FTP Server. (The one we assigned in the previous section Assigning your FTP server a static IP address)

You will repeat this process for the PASV ports as well.

I can't seem to access my router from a browser.

When I type in 192.168.0.1 into my browser address bar and hit enter, I get a Connections Has Timed Out error. "The server at 192.168.0.1 is taking too long to respond."

On the router, the firewall is the issue with ftp and configuring the same is needed. You have to set a rule to activate the same via port 21 which must be opened and the same must be associated with a single pc or whichever is the ftp server. In any case before passing through a dynamic DNS, you should check if it works already with the ip address or not. You can not access your ftp by typing in your network address or the dns name.