Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > comp.programming > #1247

Re: Ideas on solving the file transfer problem

Show all headers | View raw

Robert Wessel <robertwessel2@yahoo.com> wrote:
> On Thu, 19 Jan 2012 21:22:13 +0000, Rui Maciel <rui.maciel@gmail.com>
> wrote:
> 
>>Robert Wessel wrote:
>>
>>> Binding to ports 20 and 21 is the least of the problems for an
>>> unprivileged FTP server.  The big problem is that most firewalls will
>>> never let that traffic in, so something like that won't happen without
>>> the cooperation of the network security crew.  
>>
>>Domestic users tend to control their own firewalls.  Would they be affected 
>>by this?
> 
> 
> Well, sometimes they do.  But doesn't making such a change move this
> out of the range of easy solution for the vast majority of users?
> 
> But FTP ports are commonly blocked by (residential) ISPs, along with
> SMTP and a few others.  You can often ask to get them unblocked.
> 
> 
>>> And given the
>>> prevalence of NAT, you have address and DNS issues as well (which are
>>> really more network issues).
>>
>>DNS wouldn't be a problem, as domain names aren't exactly necessary.  NAT 
>>wouldn't be a bigger problem than it already is.
> 
> 
> Given the two channel nature of FTP, NAT is a bigger problem than
> usual.  Most firewalls that support FTP have specific code to deal
> with the data connection.  PASV mode helps, but isn't usually the
> default, and is often disabled on FTP servers.
> 
> But even the usual problems caused by NAT are bad enough, as it blocks
> all incoming connections by default.  And NAT then imposes an extra
> step to determine what the externally visible IP address is.
> 
> And without some DNS support, the fairly frequent reassignment of IP
> addresses, particularly for residential users, makes using IP
> addresses a challenge.  Remember, this needs to be easy.
> 
> Perhaps Skype would be a good solution (you can send files during a
> conversation).

I know the OP requested that no third party be involved, but
if that requirement is relaxed OneSwarm is a free solution.

Back to comp.programming | Previous | Next — Previous in thread | Next in thread | Find similar

Thread

Ideas on solving the file transfer problem Rui Maciel <rui.maciel@gmail.com> - 2012-01-15 17:17 +0000
  Re: Ideas on solving the file transfer problem "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2012-01-15 18:35 +0100
    Re: Ideas on solving the file transfer problem Rui Maciel <rui.maciel@gmail.com> - 2012-01-15 18:07 +0000
      Re: Ideas on solving the file transfer problem "Dmitry A. Kazakov" <mailbox@dmitry-kazakov.de> - 2012-01-15 20:19 +0100
        Re: Ideas on solving the file transfer problem Rui Maciel <rui.maciel@gmail.com> - 2012-01-15 19:42 +0000
  Re: Ideas on solving the file transfer problem Willem <willem@toad.stack.nl> - 2012-01-15 19:15 +0000
    Re: Ideas on solving the file transfer problem Rui Maciel <rui.maciel@gmail.com> - 2012-01-15 20:10 +0000
  Re: Ideas on solving the file transfer problem Leif Roar Moldskred <leifm@dimnakorr.com> - 2012-01-18 09:16 -0600
    Re: Ideas on solving the file transfer problem Rui Maciel <rui.maciel@gmail.com> - 2012-01-19 16:26 +0000
      Re: Ideas on solving the file transfer problem Robert Wessel <robertwessel2@yahoo.com> - 2012-01-19 14:59 -0600
        Re: Ideas on solving the file transfer problem Rui Maciel <rui.maciel@gmail.com> - 2012-01-19 21:22 +0000
          Re: Ideas on solving the file transfer problem Robert Wessel <robertwessel2@yahoo.com> - 2012-01-19 15:54 -0600
            Re: Ideas on solving the file transfer problem root <NoEMail@home.org> - 2012-01-19 22:20 +0000
              Re: Ideas on solving the file transfer problem Robert Wessel <robertwessel2@yahoo.com> - 2012-01-19 17:43 -0600
                Re: Ideas on solving the file transfer problem Rui Maciel <rui.maciel@gmail.com> - 2012-01-20 04:22 +0000
                Re: Ideas on solving the file transfer problem Robert Wessel <robertwessel2@yahoo.com> - 2012-01-19 23:43 -0600
                Re: Ideas on solving the file transfer problem Rui Maciel <rui.maciel@gmail.com> - 2012-01-20 12:59 +0000
                Re: Ideas on solving the file transfer problem Geoff <geoff@invalid.invalid> - 2012-01-20 02:41 -0800
                Re: Ideas on solving the file transfer problem Rui Maciel <rui.maciel@gmail.com> - 2012-01-20 12:45 +0000
                Re: Ideas on solving the file transfer problem Geoff <geoff@invalid.invalid> - 2012-01-20 15:41 -0800
                Re: Ideas on solving the file transfer problem root <NoEMail@home.org> - 2012-01-21 00:18 +0000
                Re: Ideas on solving the file transfer problem Geoff <geoff@invalid.invalid> - 2012-01-20 16:41 -0800
                Re: Ideas on solving the file transfer problem Robert Wessel <robertwessel2@yahoo.com> - 2012-01-20 18:44 -0600
                Re: Ideas on solving the file transfer problem Geoff <geoff@invalid.invalid> - 2012-01-20 15:43 -0800
                Re: Ideas on solving the file transfer problem Robert Wessel <robertwessel2@yahoo.com> - 2012-01-20 18:34 -0600
                Re: Ideas on solving the file transfer problem "Chris Uppal" <chris.uppal@metagnostic.REMOVE-THIS.org> - 2012-01-21 10:21 +0000
              Re: Ideas on solving the file transfer problem Rui Maciel <rui.maciel@gmail.com> - 2012-01-20 03:59 +0000
            Re: Ideas on solving the file transfer problem Rui Maciel <rui.maciel@gmail.com> - 2012-01-20 03:44 +0000
              Re: Ideas on solving the file transfer problem Robert Wessel <robertwessel2@yahoo.com> - 2012-01-19 23:41 -0600
    Re: Ideas on solving the file transfer problem Ian Collins <ian-news@hotmail.com> - 2012-01-20 14:07 +1300
      Re: Ideas on solving the file transfer problem blp@cs.stanford.edu (Ben Pfaff) - 2012-01-19 18:20 -0800
      Re: Ideas on solving the file transfer problem Leif Roar Moldskred <leifm@dimnakorr.com> - 2012-01-19 20:33 -0600
        Re: Ideas on solving the file transfer problem Rui Maciel <rui.maciel@gmail.com> - 2012-01-20 04:08 +0000

csiph-web