Ahh you have a router...yes as the bear from Belgium says you need to configure your router.
On my router you would have to set up a virtual server....with port 21 open directed at the PC on your LAN that is running the FTP server....such as 192.*.* etc
When someone goes to access your ftp ...through your dynamic IP and port 21 your router should route the call through to the PC running the FTP server.
I have done this with PC Anywhere running on my three pc's that I can all control from my laptop.
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