Public bug reported:

Ubuntu freshly updated to 16.04. Whenever cups-browsed is running, it
generates around 1 to 1.5 Mbps of incoming traffic, in regular spikes of
2.5Mbps. The cups log shows messages like this every few seconds:

E [21/Mar/2016:13:01:22 -0300] [Client 2130] Returning IPP 
client-error-bad-request for CUPS-Add-Modify-Printer 
(ipp://localhost:631/printers/DTsPrinters) from localhost
E [21/Mar/2016:13:01:22 -0300] [Client 2130] Returning IPP 
client-error-bad-request for CUPS-Add-Modify-Printer 
(ipp://localhost:631/printers/LabelPrinters) from localhost
E [21/Mar/2016:13:01:22 -0300] [Client 2130] Returning IPP 
client-error-bad-request for CUPS-Add-Modify-Printer 
(ipp://localhost:631/printers/ZT220) from localhost
E [21/Mar/2016:13:01:23 -0300] [Client 2130] Returning IPP 
client-error-bad-request for CUPS-Add-Modify-Printer 
(ipp://localhost:631/printers/Zebra-GK420t) from localhost


These are al remote printers that are on different Ubuntu 14.04 servers.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: cups-browsed 1.8.2-2ubuntu3
ProcVersionSignature: Ubuntu 4.4.0-14.30-generic 4.4.5
Uname: Linux 4.4.0-14-generic x86_64
ApportVersion: 2.20-0ubuntu3
Architecture: amd64
CurrentDesktop: GNOME
Date: Mon Mar 21 12:54:49 2016
InstallationDate: Installed on 2015-01-23 (422 days ago)
InstallationMedia: Ubuntu-GNOME 14.04.1 LTS "Trusty Tahr" - Release amd64 
(20140722.2)
MachineType: LENOVO 20266
Papersize: letter
PpdFiles:
 Error: command ['fgrep', '-H', '*NickName', '/etc/cups/ppd/Star_TSP143_.ppd', 
'/etc/cups/ppd/Brother_MFC-6890CDW.ppd', 
'/etc/cups/ppd/HP_LaserJet_CP_1025nw.ppd', 
'/etc/cups/ppd/ZTC-ZT230-200dpi-ZPL.ppd', '/etc/cups/ppd/Epson_T1110.ppd'] 
failed with exit code 2: grep: /etc/cups/ppd/Star_TSP143_.ppd: Permission denied
 grep: /etc/cups/ppd/Brother_MFC-6890CDW.ppd: Permission denied
 grep: /etc/cups/ppd/HP_LaserJet_CP_1025nw.ppd: Permission denied
 grep: /etc/cups/ppd/ZTC-ZT230-200dpi-ZPL.ppd: Permission denied
 grep: /etc/cups/ppd/Epson_T1110.ppd: Permission denied
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-14-generic.efi.signed 
root=UUID=eecad38d-4fff-462c-92bc-357fa12e5515 ro quiet splash vt.handoff=7
SourcePackage: cups-filters
UpgradeStatus: Upgraded to xenial on 2016-03-21 (0 days ago)
dmi.bios.date: 03/25/2014
dmi.bios.vendor: LENOVO
dmi.bios.version: 76CN35WW
dmi.board.asset.tag: No Asset Tag
dmi.board.name: Yoga2
dmi.board.vendor: LENOVO
dmi.board.version: 31900058STD
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Lenovo Yoga 2 Pro
dmi.modalias: 
dmi:bvnLENOVO:bvr76CN35WW:bd03/25/2014:svnLENOVO:pn20266:pvrLenovoYoga2Pro:rvnLENOVO:rnYoga2:rvr31900058STD:cvnLENOVO:ct10:cvrLenovoYoga2Pro:
dmi.product.name: 20266
dmi.product.version: Lenovo Yoga 2 Pro
dmi.sys.vendor: LENOVO

** Affects: cups-filters (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug xenial

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https://bugs.launchpad.net/bugs/1560099

Title:
  cups-browsed generates constant and significant network traffic

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