FTP Client through proxy details

[Dave Roberts <djr @ reims . net>]

I am aware of various methods for ftp clients to use a proxy server.
Common ones seem to be 'SITE ftpserver', 'OPEN ftpserver' and 'USER
user @
 server'.  However, I'm attempting to get detailed analysis of the
first two.

If someones firewall uses this method, would they be kind enough to send
me a trace to show the commands passed back and forth.  Of course you can
change the names/addresses to protect the innocent.  A trace from both
sides of the firewall would be useful.

TIA

- Dave.