Note: Initial bug report was made under 12.10, but the following retest
performed under 14.04.1.

We seem to have a couple of different problems, both indicating a lack
of IPv6 support.

1) Scanner detection over the network is performed with BJNP, and the 
specification seems to be tied to using IPv4 broadcast.
2) Manual specification of the scanner in the backend configuration is 
unsuccessful:

kjotte@daedalus:~$ cat /etc/sane.d/pixma.conf 
# pixma.conf configuration for the sane pixma backend
#
# define URI's of scanners (one per line)
# This is only used for network scanners.
# normally scanners will be detected by sending a broadcast
# if this does not work under your OS, or if the scanners
# are on a different subnet, configure your scanners URI here
#
# method must be bjnp
# port number can normally be left out, port 8612 is used as default
# Example:
# bjnp://myscanner.my.domain:8612
# bjnp://printer-1.pheasant.org
#
bjnp://gonzo.mibloving.net

kjotte@daedalus:~$ scanimage -L
[pixma] Cannot resolve hostname: gonzo.mibloving.net

No scanners were identified. If you were expecting something different,
check that the scanner is plugged in, turned on and detected by the
sane-find-scanner tool (if appropriate). Please read the documentation
which came with this software (README, FAQ, manpages).
kjotte@daedalus:~$ host gonzo.mibloving.net
gonzo.mibloving.net has IPv6 address 2001:470:8:f04:8a87:17ff:fe3b:fe0d

-- 
You received this bug notification because you are a member of Desktop
Packages, which is subscribed to sane-backends in Ubuntu.
https://bugs.launchpad.net/bugs/1160650

Title:
  cannot detect IPv6 scanner

Status in “sane-backends” package in Ubuntu:
  Confirmed

Bug description:
  A network scanner running only in IPv6 mode cannot be detected by
  SANE.

  $ avahi-browse -av
  Server version: avahi 0.6.31; Host name: scooter.local
  E Ifce Prot Name                                          Type                
 Domain
  ...
  +  wlan0 IPv6 Canon MX870 series _3E420E3BFE0D              _scanner._tcp     
   local

  $ scanimage -L
  scanimage: no SANE devices found

  However, if the device is configured for IPv4, it is visiable to SANE:

  $ avahi-browse -av
  Server version: avahi 0.6.31; Host name: scooter.local
  E Ifce Prot Name                                          Type                
 Domain
  ...
  +  wlan0 IPv4 Canon MX870 series _3E420E3BFE0D              _scanner._tcp     
   local

  $ scanimage -L
  device `pixma:MX870_gonzo' is a CANON Canon PIXMA MX870 multi-function 
peripheral

  The device in question can only operate in one mode or the other, not
  dual-stack. We would prefer to use IPv6 wherever possible in our
  environment, so this is a blocker.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: libsane 1.0.23-0ubuntu1
  ProcVersionSignature: Ubuntu 3.5.0-26.42-generic 3.5.7.6
  Uname: Linux 3.5.0-26-generic i686
  ApportVersion: 2.6.1-0ubuntu10
  Architecture: i386
  Date: Tue Mar 26 20:07:52 2013
  InstallationDate: Installed on 2013-01-23 (62 days ago)
  InstallationMedia: Xubuntu 12.10 "Quantal Quetzal" - Release i386 (20121017.1)
  MarkForUpload: True
  SourcePackage: sane-backends
  UpgradeStatus: No upgrade log present (probably fresh install)

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