I have a Canon MF642c and the scanner wouldn't work. I tried to use saned but it didn't work with the BJNP like it did for some other Canon models.
Introducing sane-airscan with packages for the most common distributions: https://software.opensuse.org/download.html?project=home%3Apzz&package=sane-airscan
Just install the package and you should be able to use normal Linux based tools to scan like SimpleScan, it allows me to use my Canon over the network to scan without doing any extra configuration.
How To Use:
After installing just run airscan-discover:
Canon MF642C/643C/644C (d0:e9:68) (d0:e9:68) = http://10.10.1.170:80/eSCL/, eSCL
Canon MF642C/643C/644C (d0:e9:68) (d0:e9:68) = http://10.10.1.170/active/msu/scan, WSD
Then tools like SimpleScan should just work. I can scan from the tray or have the sheetfed scanner work by choosing "Scan All Pages from Feeder".
sane-airscan is a real hero to those of us with somewhat newer scanners that xsane doesn't support or that don't have a Linux driver from the vendor.
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