On 16 May 99, at 18:57, Godmar Back wrote about
"Re: active ftp and incoming connect":
| > | a) Does an internal client have to be put in passive mode so that the
| > | ftp module at the gw will work?
| >
| > No. PASV mode is the one that works (mostly) even if you *don't*
| > have the ip_masq_ftp module loaded. The module is needed to support
| > active mode, and long file transfers.
|
| I see.
| Why is it needed for long file transfers?
Timeouts. FTP uses a separate connection for data transfers. During
a file upload/download, there is no traffic on the original control
connection. So if the data transfer takes longer than the masq
timeout, the masq entry for the control connection gets deleted.
| > The answer wasn't a), but this question puzzles me. At least on the
| > PC, I can't find any way to get web browsers (NS and IE) to use
| > *active* mode for FTP. They *always* use passive mode.
|
| I see.
| The reason I conjectured they might be using active mode was that
| I had been getting a log "Illegal PORT command" error messages from
| Netscape's ftp client, and I thought this may have had to do with it.
Interesting. PORT commands are certainly associated with active
mode, and an "Illegal port command" error is just what you'd expect
if you don't have the ip_masq_ftp module loaded.
When you say "Netscape's FTP client", do you mean something other
that Netscape Navigator when given an ftp:// URL? What version?
Running on a PC?
| Secondly, IE 5.0's setup has an option "Use Web Based FTP"
| (in Options->Advanced) --- I was wondering what that's all about.
| The help says "it works through all proxies, but only supports directory
| listings and downloads. No uploads". I wonder what that means.
No clue.
|...
- Fred Viles <mailto:[EMAIL PROTECTED]>
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