You must specify on your FTP client to use the PASSIVE (PASV) command, so that
the server does not try to connect to a private IP address, which of course
will not work.
Most FTP clients have a PASV command, and some even do this by default. When
the PASV command is sent, the FTP server will be the one to provide the
address:port combination for the client to connect to.
On Tue, 27 Jul 1999, Trenton D. Adams wrote:
>I just had this same problem. I remembered I seen a post having to do with
>this, and here I am. when I ftp using windows 98 FTP command, I get this
>error when typing ls at the command line.
>
>Can't build data connection: no PORT specified
>
>Here is what I have found about IP Masquerading. When making a connection,
>the person behind the firewall must make the initial connection. Because of
>this, the ftp logs in to the remote system just fine. (You initiated the
>connection) When you type ls, the FTP server tries to open up an ftp-data
>port back to you, but it doesn't work! Why, because like I said, you must
>initiate the inital connection. How do you do this? I don't know.
>
>Can someone please help us!
>
>> -----Original Message-----
>> From: [EMAIL PROTECTED]
>> [mailto:[EMAIL PROTECTED]]On Behalf Of Denis Chapligin
>> Sent: July 26, 1999 3:30 AM
>> To: Ruprecht Helms
>> Cc: [EMAIL PROTECTED]
>> Subject: Re: ip_masq_ftp is not working
>>
>>
>> Hi
>>
>> On Mon, 26 Jul 1999, Ruprecht Helms wrote:
>>
>> >
>> > first make a ping to the ftp-server.
>> Of course i did it:)
>> >
>> > After this ping through the net and have a look in the logfiles for
>> > example /var/log/messages.
>> Nothing.
>> > Maybe you have to reconfigure the mascarading and/or the routingtable.
>> >
>> Problem is that this works normally and i did'nt tried to reconfigure it.
>> Other masquerading services works okay.
>> Denis Chapligin
>>
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