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I had connected to the internal network (with 192.168.** address), but I still cannot see the scanner! I see only printer:

$ /opt/Samsung/mfp/bin/netdiscovery
# DEBUG: Network printers discovery utility
ip: 192.168.169.119 slp: 0,0,0,0 snmp: 1,1,0 vendor: Samsung dsc: "SCX-3400 Series"

How can I enable scanner back? I worked... And it works under Windows.

I cannot see this MFU at any computer. One "sees" only wrong network segment, and another cannot detect it as scanner, but can detect as printer. Windows machine can scan. I could scan with samsung drivers, for one year. I seems to become bad after upgrade from Linux Mint 17.1 to 17.3 (ubuntu 14.04 to 16.04), but I'm not sure.

MFU is connected to network only. I have two networks in one real network segment: 192.168.169.* and real addresses, say 1.2.3.0/28.

First machine is Linux Mint 17.3, it has real address, say, 1.2.3.5. I can print, but I cannot see scanner:

$ /opt/Samsung/mfp/bin/netdiscovery
# DEBUG: Network printers discovery utility
ip: 192.168.169.119 slp: 0,0,0,0 snmp: 1,1,0 vendor: Samsung dsc: "SCX-3400 Series"

I have installed: libtiff3-suld, suld-configurator-1-qt4, suld-driver-4.00.35, suld-driver-common-1, suld-network-2, suld-ppd-1,
suld-printer-pdf-fix, suld-scantopc, suld-scantopc-gui, suldr-keyrin.

Second machine - server, it has two physical interfaces: eth0 for Internet connection and eth1 - the same as I wrote above (say, eth1 have addresses 192.168.169.1 and 1.2.3.1). I cannot see this MFU at all (it seems, it scans only FIRST interface).

Here I have installed: libtiff3-suld, suld-configurator-1-qt4, suld-driver-4.00.35, suld-driver-common-1, suld-network-2,  suld-ppd-1, suld-printer-pdf-fix, suld-scantopc, suld-scantopc-gui, suldr-keyring.

how can I bring my scanner working?