Several problems here:
- If you're behind a proxy server that's doing network address translation, pushing an internal address into the outer world doesn't do you any good.
- If you're a "DMZ host" behind a broadband router that's getting its address via DHCP or PPPoE, you want that address, not the IP address of the machine that's running the script.
- The FTP protocol sends passwords in plaintext.
It's safer to transfer the IP address via and HTTP GET or POST to a CGI that you control. In the case of a box behind a broadband router, the CGI will see the IP address assigned to the router. That's the IP address you'll need to connect to the DMZ host. The CGI can also record the time, so that you can tell how stale the IP address is.
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