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[ih] Why FTP uses two ports?

Subject: [ih] Why FTP uses two ports?
From: dhc2 at dcrocker.net (Dave Crocker)
Date: Thu, 21 Jun 2012 07:04:53 -0700
In-reply-to: <[email protected]>
References: <[email protected]> <[email protected]>

On 6/20/2012 9:33 PM, Louis A. Mamakos wrote:
>> I want to know if anyone remembers the origins of FTP and the reason why FTP uses two ports.
>
> You can perform 3rd party file transfers, with one client orchestrating the transfer between two
> different servers.

It also allows "pure" binary exchanges.  Doing the transfer inline with 
the command channel requires an escape mechanism to get back to command 
mode.

This was back in the days when character-level processing, for this, was 
deemed expensive.

d/

-- 
  Dave Crocker
  Brandenburg InternetWorking
  bbiw.net

References:
- [ih] Why FTP uses two ports?
  - From: esuarez at fcaglp.fcaglp.unlp.edu.ar (Eduardo A. Suárez)
- [ih] Why FTP uses two ports?
  - From: louie at transsys.com (Louis A. Mamakos)

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