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Re: [bug-inetutils] An IPv6-capable FTP client is now pending.

From: Mats Erik Andersson
Subject: Re: [bug-inetutils] An IPv6-capable FTP client is now pending.
Date: Sun, 20 Mar 2011 23:45:52 +0100
User-agent: Mutt/1.5.18 (2008-05-17)

fredag den 18 mars 2011 klockan 19:02 skrev Mats Erik Andersson detta:
> Dear all,
> with a slight risk of talking to myself let me leak some
> information by mentioning that I today have reached a
> patch for our FTP client that enables IPv6 support.

I would like to add a pledge for strategic advice on
this subject. Since the first message I have elaborated
on the capacities of the client. Presently my suggestion
is based on this behaviour:

  IPv4:   1) Try EPSV, PASV, LPSV
          2) Try EPRT, PORT, LPRT

where the order indicates priority order, and where the
use of EPSV/EPRT can be toggled on/off by a command "epsv4".

  IPv6:   1) Try EPSV, LPSV
          2) Try EPRT, LPRT

I have tested all thes mechanisms against the FTP server
present in OpenBSD.

My question to all other developers is this: Is this
priority order acceptable? The inclusion of LPRT/LPSV
is made in order to cope with potentially deteriorate
servers in use. Based on the relative invisibility of
LPRT/LPSV, that method is assigned a minimal priority.

Best regards,
  Mats E A

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