Re: [TCLUG:18144] Passive FTP

[Jason J <jasonj@innominatus.com>]

I am not sure if this is right, but I believe passive ftp only uses port 21.
Active ftp uses 20 and 21. Ftp uses port 20 for the data stream while in
active mode. ftp-data is setup in /etc/services as port 20 by default. So if
you change that to 24999 it would use that.

What do you need to do with ipchains?

"Jeffrey C. Lehman" wrote:

> I'm wondering if someone could explain or tell me where some good
> documentation is regarding passive ftp transfer.  If the default port for
> ftp is on 21 i think passive ftp also needs port 20.  If the port was
> higher up, say port 25000, would passive use the next lowest port,
> 24999?  I'm also wondering if someone could explain what input and output
> commands i'd need for ipchains.  TIA.
>
> Jeff
>
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