You may also need to add 'smfp' to /etc/sane.d/dll.conf.
And check:
SANE_DEBUG_DLL=128 scanimage -L
to see a line like:
device `smfp:net;172.16.0.222' is a Samsung C460 Series on 172.16.0.222 Scanner
device `smfp:net;fddcb6f32fe00000021599fffecdf33f' is a Samsung C460 Series on fddc:b6f3:2fe0:0:215:99ff:fecd:f33f Scanner
You may also need to add 'smfp' to /etc/sane. d/dll.conf.
And check:
SANE_DEBUG_DLL=128 scanimage -L
to see a line like: 172.16. 0.222' is a Samsung C460 Series on 172.16.0.222 Scanner fddcb6f32fe0000 0021599fffecdf3 3f' is a Samsung C460 Series on fddc:b6f3: 2fe0:0: 215:99ff: fecd:f33f Scanner
device `smfp:net;
device `smfp:net;