** Changed in: avahi (Ubuntu)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/1736757
Title:
[PATCH] Avahi does not support local-only services via the loopback
interface
Status in avahi package in Ubuntu:
Fix Committed
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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