<< open port 21.
give us your external IP (the IP on the ISP side of your router)
if you go into your router's setup (usually 192.168.2.1) it should tell you your WAN IP or external IP (same thing)
good luck 🙂 >>
or winipcfg or ipconfig will give you all the info that you need. default gateway (router ip), WAN, etc... just make sure you forward requests to port 21 to the right LAN ip.