[Bug 1736757] Re: [PATCH] Avahi does not support local-only services via the loopback interface

[Launchpad Bug Tracker]

This bug was fixed in the package avahi - 0.7-3ubuntu2

---------------
avahi (0.7-3ubuntu2) bionic; urgency=low

  * local-only-services-support.patch: Added support for advertising
    local-only services on the loopback ("lo", "localhost") device. This
    is especially needed for making CUPS and cups-browsed auto-discover
    IPP-over-USB printers using ippusbxd (LP: #1736757, Upstream issue #125).

 -- Till Kamppeter <till.kamppeter at gmail.com>  Tue,  9 Jan 2017 21:35:51
-0200

** Changed in: avahi (Ubuntu)
       Status: Fix Committed => Fix Released

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Title:
  [PATCH] Avahi does not support local-only services via the loopback
  interface

Status in avahi package in Ubuntu:
  Fix Released

Bug description:
  To allow the more sophisticated functionality of IPP network printers (web admin interface, query printer capabilities and job status from printer) also on USB printers, newer USB printers support the IPP-over-USB standard which is supported under Linux via the ippusbxd package from OpenPrinting. The ippusbxd daemon connects to the USB printer and mirrors it into a virtual IPP network printer on localhost, port 60000.
  CUPS and cups-browsed find IPP printers by the printer's DNS-SD broadcasts. On Linux systems avahi-daemon is handling the registration of local services and also the discovery of remote services. This works well with local services shared to the network as Avahi does appropriate broadcasts on network interfaces (eth0, wlan0, ...) but Avahi does not handle the loopback device lo for local services ("localhost"). So the local-only IPP-over-USB printer on localhost:60000, registered by ippusbxd does not get advertised, not even locally.
  The attached patchfor the Ubuntu package of Avahi adds support for such services.
  See also the upstream bug report https://github.com/lathiat/avahi/issues/125

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