FTP does use 20, as he said to start data transfers, it however doesn't keep the transfer on 20. Just as you connect to port 21 on the server it "transfers" your connection to another random port number. Well, not entirely random. So if you connect to my ftp server at port 21 it will answer and connect on port 4700 or something. The same goes for port 20. This is so it can continue to answer connections on the same port number, to allow for multiple users. On the client end it will still appear to be port 21.
And I think Passive mode works by the either the client or server dynamically specify a data port rather than port 20. And if I remember correctly Sambar supports passive only. Please feel free to correct me on that. I'm not absolutely sure on all of that, but I'm fairly certain. Tom Faulkner CCNP, CCNA, MCP [EMAIL PROTECTED] -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of George Shaw Sent: Friday, January 31, 2003 1:25 AM To: sambar List Member Subject: [sambar] FTP Server {02} I thought FTP used port 21 strictly myself George -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] On Behalf Of Vital Touch DJs Sent: Thursday, January 30, 2003 7:52 PM To: sambar List Member Subject: [sambar] FTP Server {01} Hey All, I have an update. I have checked in with my Network Administrator at the college that I attend. I talked to him regarding the issue with the FTP. As he did say, FTP uses port 21 for Control, and port 20 to send information out to the client. However, to recap, I have noticed that the Sambar Server will send information out of ports usually starting with 4700 and for each additional packet it sends out, it will increment the port by one.. so the next data sequence sent out would be on port 4701. He was informing me that most FTP servers have an option to send all data out via port 20, or to send data out by this method of using high ports. In this case, Sambar Server does not have the function of being able to choose which port the data should be sent out of. Is this possibly something that could be worked on for the next release or beta? I don't know, it isn't a big deal, but I would like to block as many ports as possible incoming and outgoing on my server, and right now I have a large hole to allow for data to be sent. Brian S http://www.vtdj.com ------------------------------------------------------- To unsubscribe please go to http://www.sambar.ch/list/ ------------------------------------------------------- To unsubscribe please go to http://www.sambar.ch/list/ --- Incoming mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.449 / Virus Database: 251 - Release Date: 1/27/2003 --- Outgoing mail is certified Virus Free. Checked by AVG anti-virus system (http://www.grisoft.com). Version: 6.0.449 / Virus Database: 251 - Release Date: 1/27/2003 ------------------------------------------------------- To unsubscribe please go to http://www.sambar.ch/list/
