Canon printer PIXMA MG6821 User Manual

Encryption Settings Screen Appears When Access Point Selected
from Search Screen
This screen appears automatically if the selected wireless router is encrypted. Set the same encryption
settings as those set for the wireless router.

Packets Are Sent Constantly (Windows)
When IJ Network Scanner Selector EX is enabled, it periodically transmits packets to check communication
with the machine over the network. If you are using your computer in a network environment other than the
one used to set up the machine, disable IJ Network Scanner Selector EX.
To disable IJ Network Scanner Selector EX, right-click the 
 icon on the notification area on the desktop
and select  Disable Canon IJ Network Scanner Selector EX .
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Checking Network Information
Checking Machine IP Address or MAC Address
Checking Computer IP Address or MAC Address
Checking Communication Between the Computer, the Printer, and the Wireless Router
Checking Network Settings Information
Checking Machine IP Address or MAC Address
To check the machine's IP Address or MAC address, print out the network settings information or use the
operation panel to display it.
LAN settings
Printing Network Settings
You can check the network setting information on the...

Click TCP/IP  to check the IP address.
Click  Hardware  to check the MAC address.
Checking Communication Between the Computer, the Printer, and the
Wireless Router
Perform a ping test to check if communication is taking place.

If packet loss is 100%, communication is not taking place. Otherwise, computer is communicatingwith target device.
Checking Network Settings Information
To check the machine's network settings information, print out the network settings information or use the
operation panel to display it.
LAN settings
Printing Network Settings
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Restoring to Factory Defaults
Important

Problems while Printing/Scanning from Smartphone/Tablet
Cannot Print/Scan from Smartphone/Tablet
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Cannot Print/Scan from Smartphone/TabletIf you cannot print/scan from your smartphone/tablet, it is possible that your smartphone/tablet cannot
communicate with the machine.
Check the cause of your problem according to the connection method.
Cannot Communicate with Machine over Wireless LAN
Cannot Communicate with Machine while It Is in Direct Connection
Note

If the network settings of your smartphone/tablet are not identical with those of the wireless router, change thenetwork settings of it to match with those of the wireless router.
Check5  Make sure machine is not placed far away from wireless router.
The wireless router is located indoors within the effective range for wireless communication. Locate the
machine within 164 ft. / 50 m from the wireless router.
Check6  Check for obstructions.
Wireless communication between different rooms or floors is...

Check8 Make sure there is no source of radio wave interference nearby.
If a device like a microwave oven that emits radio waves of the same frequency bandwidth as a wireless router
is nearby, it may cause interference. Place the machine as far away from the interference source as possible.
Check9  Make sure 5 devices are already connected.
Direct connection does not allow more than 5 devices to be connected.
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