Hal, 

If the FTP Server is a z/OS FTP server, then I don't believe there is such a 
thing but I'm not sure that I completely understand your situation.

The usual problem is that the "port" command (which passes along the FTP 
"control" session) contains an IP address and the Server/Client sending the 
"port" command is unaware of its NATed address.

Please forgive me for answering a question with more questions but I have three:

1) Are both sides of the FTP session NATed? If not, which side is NOT NATed?
2) What product (and manufacturer) is the client software?
3) What product (and manufacturer) is the server software?  

Cheers,
Alan





-----Original Message-----
From: IBM Mainframe Discussion List [mailto:[email protected]] On Behalf Of 
Hal Merritt
Sent: Wednesday, June 01, 2011 2:47 PM
To: [email protected]
Subject: Z/os FTP Server Configurartion

One of my network guys says that some servers allow the coding of a different 
IP address to be used in the handshake.

Normally, FTP in passive mode sends the host IP address and port number for the 
client to use. This is useless if there is a NAT'ing firewall in the path. My 
guy claims that you can change that to specify any address you want, 
specifically the NAT'ed address.

Anyone know what he is talking about?


Thanks!!

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