Ange-ftp can't deal with IPV6/IPV4 fallback

[Piet van Oostrum]

Symptoms:

C-x C-f /ftp.nluug.nl:/

The problem is that the DNS first gives an IPV6 address. However our
router doesn't do IPV6. Ftp then falls back to IPV4:

ftp> open ftp.nluug.nl
Trying 2001:610:1:80aa:192:87:102:36...
ftp: connect to address 2001:610:1:80aa:192:87:102:36: No route to host
Trying 192.87.102.36...
Connected to ftp.nluug.nl.

Ange-ftp chokes on the `No route to host' message and doesn't look any
further. 

I think in the near future we will see more of this problem, so it might be
time to make anfe-ftp more intelligent.


In GNU Emacs 21.3.50.10 (powerpc-apple-darwin7.2.0)
 of 2004-03-15 on Ordesa.local
configured using `configure '--enable-carbon-app' '--without-x''

Important settings:
  value of $LC_ALL: nil
  value of $LC_COLLATE: nil
  value of $LC_CTYPE: nil
  value of $LC_MESSAGES: nil
  value of $LC_MONETARY: nil
  value of $LC_NUMERIC: nil
  value of $LC_TIME: nil
  value of $LANG: nil
  locale-coding-system: nil
  default-enable-multibyte-characters: t

Major mode: Apropos

Minor modes in effect:
  auto-image-file-mode: t
  delete-selection-mode: t
  pc-selection-mode: t
  show-paren-mode: t
  auto-compression-mode: t
  display-time-mode: t
  encoded-kbd-mode: t
  mouse-wheel-mode: t
  menu-bar-mode: t
  global-font-lock-mode: t
  font-lock-mode: t
  unify-8859-on-decoding-mode: t
  unify-8859-on-encoding-mode: t
  line-number-mode: t
  transient-mark-mode: t

Recent input:
<down-mouse-1> <mouse-movement> <mouse-1> <right> <down-mouse-1> 
<mouse-movement> <mouse-movement> <drag-mouse-1> C-w 
C-h l <down-mouse-1> <mouse-movement> <mouse-1> <up> 
<up> <up> C-x C-f / f t p . n l u u g . n l : / <return> 

Recent messages:
Mark set [2 times]
Auto-saving...done
Type C-x 4 b RET to restore the other window.  C-M-v to scroll the help.
line-move: Beginning of buffer [2 times]
Opening FTP connection to ftp.nluug.nl...
ange-ftp-error: FTP Error: OPEN request failed: ftp: connect to address 
2001:610:1:80aa:192:87:102:36: No route to host