[sane-devel] Problem with Sane over network

[Kelly Price]

This may not be a SANE problem but a networking problem.

You have 192.168.10.0/24 for your PCs and 192.168.5.0/24 for the Pi.
I assume you have something a bit better than a commercial-grade home
router/firewall -- IE an actual firewall (Cisco/Juniper).

The simple solution is to put the Pi on the same address space as your
PC.  The harder solution is to fix your firewall's routing and
permissions to let the .10.x network talk fully with the .5.x
network... but that will get into why you (or your company) have it
set up like that.

On Sun, Apr 12, 2020 at 4:28 AM Luca Bertoncello <lucabert at lucabert.de> wrote:
>
> Hi list!
>
> My first question, here...
>
> So, I have a scanner, Canon LiDE35, connected via USB to a RaspberryPI
> with Debian Buster.
> The scanner works well and I can scan using scanimage.
> I installed scanbd in order to manage the buttons on the scanner and now
> I can copy and mail documents.
> Wonderful!
>
> Last point: using the scanner from other PC in the network.
> It does NOT work... :(
>
> First of all: the Raspi is in a different network as the PCs!
> Anyway I added this line to the saned.conf on the Raspi:
>
> 192.168.10.0/24
>
> So I should use the scanner from all PCs in the network 192.168.10.0/24...
>
> In my PC with Debian Stretch (192.168.10.3), I added this line to
> /etc/sane.d/net.conf:
>
> 192.168.5.10
>
> that is the IP of the Raspi.
> In /etc/sane.d/dll.conf on my PC I have:
>
> net
>
> so that I should be able to scan over network...
> Unfortunately scanimage -L finds nothing... :(
> In the syslog of the Raspi I see:
>
> Apr 12 10:11:53 scanner systemd[1]: Started Scanner Service
> (192.168.10.3:41450).
> Apr 12 10:11:53 scanner scanbm: /usr/sbin/scanbm: dbus match
> type='signal',interface='org.freedesktop.Hal.Manager'
> Apr 12 10:11:54 scanner kernel: [ 3888.935640] usb 1-1.5: reset
> high-speed USB device number 4 using dwc_otg
> Apr 12 10:11:54 scanner saned[1024]: saned (AF-indep+IPv6) from
> sane-backends 1.0.27 starting up
> Apr 12 10:11:54 scanner saned[1024]: check_host: access by remote host:
> ::ffff:192.168.10.3
> Apr 12 10:11:54 scanner saned[1024]: init: access granted to
> lucabert@::ffff:192.168.10.3
> Apr 12 10:12:01 scanner saned[1024]: saned exiting
> Apr 12 10:12:02 scanner systemd[1]:
> scanbm at 4-192.168.5.10:6566-192.168.10.3:41450.service: Succeeded.
>
> so I'd say, that my PC is allowed to use the scanner...
> But it doesn't... :(
>
> What I see is using tcpdump:
>
> 10:11:54.352477 IP 192.168.5.10.8612 > 192.168.5.255.8612: UDP, length 16
> 10:11:54.352928 IP 192.168.5.10.8612 > 192.168.5.255.8610: UDP, length 16
> 10:11:54.363284 IP 192.168.5.10.8612 > 192.168.5.255.8612: UDP, length 16
> 10:11:54.363548 IP 192.168.5.10.8612 > 192.168.5.255.8610: UDP, length 16
>
> Of course the broadcast packets cannot reach my PC on a different network...
>
> I found some HowTo about scanning over different networks, but all of
> them refer to pixma, and I don't have this scanner...
> I tested it anyway, but (of course!) it does not work...
>
> Can someone help me?
>
> Thanks a lot!
> Luca Bertoncello
> (lucabert at lucabert.de)
>


-- 
Kelly "STrRedWolf" Price
http://redwolf.ws