Date: Thu, 28 Aug 1997 00:46:01 +0100 From: Brian Somers <brian@awfulhak.org> To: Nate Williams <nate@mt.sri.com> Cc: hackers@FreeBSD.ORG Subject: Re: FTP protocol questions (non-passive mode) Message-ID: <199708272346.AAA02484@awfulhak.demon.co.uk> In-Reply-To: Your message of "Wed, 27 Aug 1997 16:34:07 MDT." <199708272234.QAA02520@rocky.mt.sri.com>
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> Can anyone explain to me the FTP 'Data' channel protocol?
>
> As I understand it, the client creates a socket, and the server binds to
> it, and then the 'DATA' is sent to it. How does the server know which
> port to bind on the client? Is there something obvious I don't
> understand as to why they couldn't use the original 'channel'?
>
> Thanks for any help!
The client, after creating a listening socket, sends a "PORT" command
describing the IP & port that the server should bind to.
It's done this way because it's easier. Ftp was designed way before
things like firewalls made it a pain in the ass.
>
> Nate
--
Brian <brian@awfulhak.org>, <brian@freebsd.org>
<http://www.awfulhak.org>;
Don't _EVER_ lose your sense of humour....
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