Talk: File transfer protocol
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Do we really need a cross-reference to Archie in 2003? Vicki Rosenzweig
"It is hard to filter FTP traffic using a firewall, since the data connection is made to an apparently arbitary port". Is this really true? Is it not possible to just use passive FTP?
- You can, but not everything can be switched into passive mode in an obvious way. It's really quite annoying. --Brion 16:42, 10 Aug 2003 (UTC)
Active and passive mode
I've put a description of active mode FTP. Will do passive mode later. - Ta bu shi da yu 00:37, 13 Oct 2004 (UTC)
Active mode Port on the Server
In the text it is mentioned that the port on the server is 21, this is the control port. The data port should be 20.
- client sends "port x"
- servers opens connection from "server:port 20" to "client:port x"
- Not according to the RFC: "8. CONNECTION ESTABLISHMENT: The FTP control connection is established via TCP between the user process port U and the server process port L. This protocol is assigned the service port 21 (25 octal), that is L=21." [1] - Ta bu shi da yu 11:04, 27 Oct 2004 (UTC)
