[sane-devel] Scanner with IP on a different network

[AG]

On 4/25/22 17:38, Torfinn Ingolfsen wrote:
> On Mon, Apr 25, 2022 at 4:51 PM AG via sane-devel
> <sane-devel at alioth-lists.debian.net> wrote:
>> Thanks Ralph, I do not quite understand the technical explanation but I will try editing the pixma.conf file and see if that does the trick.
>>
>> Alf
> Generally, many devices today use multicast dns (aka mdns, avahi,
> zeroconf, bonjour) for _discovery_ of services on a network. This type
> of discovery only works on the local (ip) subnet (there are
> exceptions, but this usually requires setting up some sort of gateway
> between two networks).
>
> So while sane works nicely with an ip address or hostname as long as
> you can reach it, discovery of services might not work outside of the
> local ip subnet.
Thanks Torfinn. The family home LAN1, 192.168.1.X, is connected with 
gateway directly out to the public internet. The printer-scanner is 
connected to this LAN and accessible from it. Then there is a separate 
second LAN2, 192.168.0.X, with gateway out to the first LAN1 and the 
Linux computer is connected to this second LAN and from there to the 
Internet through LAN1.

I will try specifying the IP address directly in pixma.conf but it would 
be nice if I could tell SANE to also search the 192.168.1.X range or, 
maybe, it would be possible to set up a virtual (fictitious) IP address 
in LAN2, say 192.168.0.333 which the router would convert and redirect 
to LAN1, say 192.168.1.333.

I am just playing around with ideas because I am no expert with 
networking or anything else. Until now I just connected the computer to 
LAN1 when I needed to scan which is infrequently. If I can specify the 
IP address directly in the pixma.conf file that would solve the issue 
but I just like kicking ideas around and maybe learning a bit.

When I set up the printer part I just put the IP address in the printer 
properties configuration and it worked right away. It would be nice if 
the scanner part was just as easy.

Alf