Groups > comp.os.linux.networking > #4234

Re: Need help with iptables and ftp

From	Dan Purgert <dan@djph.net>
Newsgroups	comp.os.linux.networking
Subject	Re: Need help with iptables and ftp
Date	2018-08-31 09:25 +0000
Organization	A noiseless patient Spider
Message-ID	<slrnpoi2c6.u91.dan@xps-linux.djph.net> (permalink)
References	(4 earlier) <pm62la$hhm$1@dont-email.me> <slrnpod497.u91.dan@xps-linux.djph.net> <op.zoiklrkha3w0dxdave@hodgins.homeip.net> <pqmk5f-nau.ln1@gangtai.home.grep.be> <pma1t7$eo5$1@dont-email.me>

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William Unruh wrote:
> On 2018-08-30, Wouter Verhelst <w@uter.be> wrote:
>> On 8/29/18 5:14 PM, David W. Hodgins wrote:
>>> As to the questions of why use ftp instead
>>> of something secure, there are many times where publicly shared files
>>> have no need for security, so ftp is the lowest overhead option for
>>> those transfers.
>>
>> No, HTTP is. FTP, with is two ports, incurs a high amount of overhead on
>> all middle boxes for no particularly good reason.
>>
>> FTP must die.
>
> Not before something equivalent replaces it. From when I have used http,
> I have not beeen impressed.

Well, there is SFTP.  Other than using ssh transport, and "exit" rather
than "bye", it's pretty much identical.  Need to use an sftp-capable
client though (not 100% sure if web-browsers will play well with it,
though I've never tried).

>
> But it is not clear to me what this "high overhead" is. Why is it any
> higher than  one port? The packets have to be routed in any case, and
> only the two end machines have to keep track of how the traffic on the
> two routes relates to each other.

Spartknotes / pre-coffee version of the story is that you have two
sessions in conntrack (port 21 for the control session, and related-port
"whatever" for the data session).  It's mainly the two endpoints
(assuming the FTP server is behind NAT) that're getting this overhead
more than "everything" in the middle though.

-- 
|_|O|_| Registered Linux user #585947
|_|_|O| Github: https://github.com/dpurgert
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Thread

Need help with iptables and ftp T <T@invalid.invalid> - 2018-08-24 15:39 -0700
  Re: Need help with iptables and ftp T <T@invalid.invalid> - 2018-08-24 16:11 -0700
  Re: Need help with iptables and ftp Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-08-25 07:23 +0000
    Re: Need help with iptables and ftp T <T@invalid.invalid> - 2018-08-25 23:13 -0700
      Re: Need help with iptables and ftp Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-08-26 11:35 +0200
        Re: Need help with iptables and ftp T <T@invalid.invalid> - 2018-08-26 14:05 -0700
          Re: Need help with iptables and ftp William Unruh <unruh@invalid.ca> - 2018-08-27 00:02 +0000
            Re: Need help with iptables and ftp T <T@invalid.invalid> - 2018-08-26 17:11 -0700
              Re: Need help with iptables and ftp William Unruh <unruh@invalid.ca> - 2018-08-27 02:00 +0000
                Re: Need help with iptables and ftp T <T@invalid.invalid> - 2018-08-26 19:37 -0700
                Re: Need help with iptables and ftp "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2018-08-26 22:59 -0400
                Re: Need help with iptables and ftp T <T@invalid.invalid> - 2018-08-26 20:42 -0700
                Re: Need help with iptables and ftp "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2018-08-27 00:29 -0400
                Re: Need help with iptables and ftp T <T@invalid.invalid> - 2018-08-26 22:06 -0700
                Re: Need help with iptables and ftp William Unruh <unruh@invalid.ca> - 2018-08-27 09:47 +0000
                Re: Need help with iptables and ftp Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-03 20:47 +0200
                Re: Need help with iptables and ftp William Unruh <unruh@invalid.ca> - 2018-08-27 09:44 +0000
                Re: Need help with iptables and ftp "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2018-08-27 06:17 -0400
                Re: Need help with iptables and ftp T <T@invalid.invalid> - 2018-08-27 12:21 -0700
                Re: Need help with iptables and ftp Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-03 20:55 +0200
                Re: Need help with iptables and ftp Scott Hemphill <hemphill@hemphills.net> - 2018-08-27 11:22 -0400
                Re: Need help with iptables and ftp T <T@invalid.invalid> - 2018-08-27 12:18 -0700
          Re: Need help with iptables and ftp T <T@invalid.invalid> - 2018-08-26 17:44 -0700
      Re: Need help with iptables and ftp T <T@invalid.invalid> - 2018-08-26 17:43 -0700
  Re: Need help with iptables and ftp Dan Purgert <dan@djph.net> - 2018-08-28 11:28 +0000
    Re: Need help with iptables and ftp Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-08-29 05:38 +0000
      Re: Need help with iptables and ftp Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2018-08-29 10:13 +0300
      Re: Need help with iptables and ftp Dan Purgert <dan@djph.net> - 2018-08-29 09:52 +0000
        Re: Need help with iptables and ftp William Unruh <unruh@invalid.ca> - 2018-08-29 12:13 +0000
          Re: Need help with iptables and ftp Dan Purgert <dan@djph.net> - 2018-08-29 12:27 +0000
            Re: Need help with iptables and ftp "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2018-08-29 11:14 -0400
              Re: Need help with iptables and ftp Aragorn <thorongil@telenet.be> - 2018-08-29 23:15 +0200
              Re: Need help with iptables and ftp Wouter Verhelst <w@uter.be> - 2018-08-30 10:35 +0200
                Re: Need help with iptables and ftp Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-08-30 13:16 +0000
                Re: Need help with iptables and ftp Richard Kettlewell <invalid@invalid.invalid> - 2018-08-30 16:15 +0100
                Re: Need help with iptables and ftp Wouter Verhelst <w@uter.be> - 2018-08-30 18:42 +0200
                Re: Need help with iptables and ftp William Unruh <unruh@invalid.ca> - 2018-08-31 00:31 +0000
                Re: Need help with iptables and ftp Jorgen Grahn <grahn+nntp@snipabacken.se> - 2018-08-31 05:49 +0000
                Re: Need help with iptables and ftp Wouter Verhelst <w@uter.be> - 2018-08-31 12:48 +0200
                Re: Need help with iptables and ftp William Unruh <unruh@invalid.ca> - 2018-08-31 22:11 +0000
                Re: Need help with iptables and ftp Tauno Voipio <tauno.voipio@notused.fi.invalid> - 2018-09-01 09:56 +0300
                Re: Need help with iptables and ftp Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-01 16:14 +0200
                Re: Need help with iptables and ftp Wouter Verhelst <w@uter.be> - 2018-09-04 18:00 +0200
                Re: Need help with iptables and ftp Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-04 20:36 +0200
                Re: Need help with iptables and ftp Wouter Verhelst <w@uter.be> - 2018-09-05 10:25 +0200
                Re: Need help with iptables and ftp Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-05 20:30 +0200
                Re: Need help with iptables and ftp Wouter Verhelst <w@uter.be> - 2018-09-06 00:03 +0200
                Re: Need help with iptables and ftp Pascal Hambourg <pascal@plouf.fr.eu.org> - 2018-09-01 15:56 +0200
                Re: Need help with iptables and ftp William Unruh <unruh@invalid.ca> - 2018-09-01 19:18 +0000
                Re: Need help with iptables and ftp Wouter Verhelst <w@uter.be> - 2018-09-04 18:01 +0200
                Re: Need help with iptables and ftp William Unruh <unruh@invalid.ca> - 2018-08-31 00:25 +0000
                Re: Need help with iptables and ftp "David W. Hodgins" <dwhodgins@nomail.afraid.org> - 2018-08-30 20:34 -0400
                Re: Need help with iptables and ftp Dan Purgert <dan@djph.net> - 2018-08-31 09:25 +0000
                Re: Need help with iptables and ftp Wouter Verhelst <w@uter.be> - 2018-08-31 12:50 +0200
                Re: Need help with iptables and ftp Dan Purgert <dan@djph.net> - 2018-08-31 11:13 +0000
                Re: Need help with iptables and ftp Allodoxaphobia <knock_yourself_out@example.net> - 2018-08-31 12:30 +0000

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