===== Setting up a network scanner with SANE =====

First, install Avahi and SANE on the server:

<code bash>
sudo apt install avahi-daemon libnss-mdns sane-utils
</code>

Then edit the SANE daemon configuration:

<file bash /etc/default/saned>
# Set to yes to start saned
RUN=yes
</file>
\\

Add user ''saned'' to the ''lp'' and ''scanner'' groups.

<code bash>
sudo usermod -a -G lp,scanner saned
</code>
\\

Check whether your scanner is recognized. If it’s not, you’re probably missing a driver, such as ''hplip''. Or worse.

<code bash>
scanimage -L
</code>

The output will look something like this:

<code bash>
device 'hpaio:/usb/Photosmart_C4500_series' is a Hewlett-Packard Photosmart_C4500_series all-in-one
</code>
\\

If all is well, edit the SANE server configuration and add your subnet to the access list.

<file bash /etc/sane.d/saned.conf>
# The hostname matching is not case-sensitive.
192.168.0.0/24
</file>
\\

If you’re using a firewall (ufw in this case), you’ll have to open some ports:

<code bash>
sudo ufw allow from 192.168.0.0/24 to any port 5353 proto udp
sudo ufw allow from 192.168.0.0/24 to any port 6566 proto tcp
sudo ufw allow from 192.168.0.0/24 to any port 40000:40100 proto tcp
</code>

Then set the port range in ''/etc/sane.d/saned.conf'' accordingly:

<file bash /etc/sane.d/saned.conf>
# Port range for the data connection.
data_portrange = 40000 - 40100
</file>
\\

Finally, start ''saned'':

<code bash>
sudo systemctl start saned.socket
sudo systemctl enable saned.socket
</code>
\\

All that’s left to do now is having the client computers look for the SANE server. Unlike CUPS, this isn’t autodetected.\\
Edit ''/etc/sane.d/net.conf'' and add your server’s hostname or IP address to the bottom.

<file bash /etc/sane.d/net.conf>
scanserver.local
</file>

Launch Simple Scan (or another SANE front-end), and your network scanner should be found within a few seconds.

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