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Annoyingly, it seems I'm about to lose the ID I've had since 2000-something. Ah well. I'm still Paul. Just not here.

Here I am Paul~enwiki :-/

Paul

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The mysterious vanishing Paul. I thought I'd put myself back in with the name under which I edited what seems like ages ago, but probably wasn't. Now there's a sentence crying out for an edit.

There is half-digested text about ftp and its secure cousins at the bottom of the page...


  • Somebody keeps requesting password resets for me - please stop it -Paul 11:02, 29 November 2005 (UTC)
  • It's getting ridiculous - twice this week, for instance. The latest request from 64.236.245.243. Pick your own user ID, please! - Paul 20:44, 19 January 2006 (UTC)
  • And again - go away, children, please!

OK. The following attempts (for as far back as I have records) - let's see if there is a pattern:

  • 202.156.6.54 at 2006-01-19 00:43 GMT (...cache.maxonline.com.sg)
  • 64.236.245.243 at 2006-01-19 11:52 (...gate.timeinc.com)
  • 66.215.196.168 at 2006-02-01 09:10 (...dhcp.ccmn.ca.charter.com)
  • 66.215.196.168 at 2006-02-01 09:11
  • 66.215.196.168 at 2006-02-01 09:11 - third time that day
  • 136.206.1.17 at 2006-02-01 12:33 (...proxy3.dcu.ie)
  • 69.195.15.84 at 2006-02-05 00:41 GMT (...cpe.net.cable.rogers.com)
  • 68.230.173.217 at 2006-02-08 14:46 (...nc.hr.cox.net)
  • 68.230.173.217 at 2006-02-08 14:51
  • 68.230.173.217 at 2006-02-08 15:00
  • 68.230.173.217 at 2006-02-08 15:00
  • 68.230.173.217 at 2006-02-08 15:01
  • 195.93.21.71 at 2006-02-08 21:25 (cache-los-ac07.proxy.aol.com)
  • 172.209.210.215 at 2006-02-09 21:23 (...ipt.aol.com)


X-ray
X-rays are a form of high-energy electromagnetic radiation, with wavelengths shorter than those of ultraviolet rays and longer than those of gamma rays – roughly in the range of 0.01 to 10 nanometres. X-rays were discovered by German scientist Wilhelm Röntgen in 1895, who named them X-radiation to signify an unknown type of radiation. X-rays can penetrate many solid substances such as construction materials and living tissue, and X-ray radiography is widely used in medical diagnostics. This medical significance was noticed by Röntgen shortly after he discovered X-rays; this print, titled Hand mit Ringen (Hand with Rings), is a print of his first medical X-ray, taken of his wife Anna Bertha Ludwig's hand in December 1895.Print credit: Wilhelm Röntgen; restored by Yann Forget

Stuff wot I done wrote

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What can I say. I edit stuff occasionally (often on computing, Ireland, gramer an speling). And I'm called Paul.

Some articles I've written or contributed significantly to include:

There are probably more - maybe even on interesting topics - but I can't seem to think of any right now.

Random comments :-)

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Well, hello vanishing Paul;-) -- WojPob

Hi, Woj! -- Paul >:<

I think I need to reference this RFC [1].

FTP and Secure variants

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Right now, this is just a set of notes for me... A disambiguation / introduction article might have less information than this. It might also have corrections.

There is a maze of file transfer protocols - especially when you start to look at secure ones. It's complicated by the way many of them use identical or similar names.

  1. FTP - the venerable and insecure file transfer protocol, uses 2 connections on different ports (20 & 21)
    • RFC 959 (with later extensions)
    • active mode: client tells server which port it is listening on, server connects from port 20 & exchanges file
    • passive mode: client asks server to pick a port, client connects to that port on server (works better with NAT)
  2. SSH file transfer protocol (files exchanged using ssh on port 22)
    • no RFC for this. Most widely used versions v3 & v4 (v6 was documented in an expired internet draft)
    • this is PROBABLY the one you want, for transferring files securely
    • sftp (by OpenSSH) is one client for this protocol
    • not to be confused with FTP over SSH, sometimes called Secure FTP (rare)
    • Secure File Transfer Protocol sometimes refers to SSH file transfer protocol (& sometimes to FTP over SSH)
    • compare with scp (secure copy, which is a simpler file copy protocol also run over ssh)
    • end to end security => harder to proxy/control/log at network perimiter (man in the middle proxies exist)
  3. FTP with SSL/TLS, (aka ftp-ssl, or ftps, or ftp secure) ?
    • RFC 4217 (uses same security standards/certs as secure https web traffic - server needs a certificate)
    • firewall issue - cannot snoop packets to determine what ports to open for ftp data channel
    • implicit security - deprecated, uses tcp ports 989 & 990.
    • explicit security - through new ftp AUTH command in RFC 2228, same ports as normal ftp
  4. FTP over SSH
    • because FTP uses multiple connections, it it trickier to use over ssh.
    • needs intelligence in the file transfer client or in the ssh client to ensure both connections are encrypted
  5. Secure File Transfer Protocol (secure FTP) is a confusing term
    • sometimes it refers to SSH file transfer protocol (2, above - possibly due to the latter's "sftp" client)
    • sometimes it refers to FTP over SSH (3, above)
  6. Simple File Transfer Protocol (rarely used)
    • RFC 913: uses port 115, ancient
    • this is a silly protocol. Don't go there.
  7. TFTP - Trivial FTP (insecure, simple, sometimes used for booting over network)
    • RFC 1350: via UDP
    • not useful for generalised file transfer


References

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  1. ^ RFC 3696