For days I have been trying to set one from a local network (family) to a printer in another local network (net). I use LUCI for that.
The only thing I find is "Network / static routes" and it looks very simple.
Under interface: family
Under Destination: IP of the printer
Under IP4 mask 255.255.255.255
Under IP gateway: since I have already tried the default GW of famaly and lan
Under route type I already tried all entries
I can not ping the printer and can not call the web frontend. I have already extended the network mask on the printer to 255.255.0.0.
config interface 'lan'
option type 'bridge' # There was a bridge in the OpenWRT image. Can I delete this line?
option ifname 'eth0'
option proto 'static'
option ipaddr '192.168.100.1'
option netmask '255.255.255.0'
option ip6assign '60' # I do not need an ip6. Can I delete this line?
option dns '192.168.100.66 192.168.100.141' # internal DNS
option delegate '0'
option interface 'family'
option target '192.168.100.104'
option type 'anycast' # I tried all types
option gateway '192.168.100.1' # or I need 192.168.103.254???
IP of the printer 192.168.100.104
The PC from which I want to access the printer is connected to family and gets its IP from dhcp.
You're using 802.1q VLAN tags (subinterfaces), on a device with a single Ethernet socket. Is it connected to a VLAN-aware switch?
The problem isn't your routing table (both subnets are "connected" directly to the router, so no extra routing definitions are required). The problem is - at a guess - that you're using VLAN tags on equipment which might not be VLAN-aware.
Yes, I use vlan. But all devices (here the PC and the printer) are connected to untagged-posts, that means the switch removes the tags from the devices. The devices get nothing from it, that there is a vlan, only the router, of course.
It's easy enough to test. If all devices are on the same physical L1/L2 network, and you're confident that all VLAN tags get stripped, then you can carry out a test from a single computer.
From a computer in the subnet 192.168.100.0/24, ping the router (192.168.100.1). Does it respond?
Now reconfigure that same computer to give it an IP address in 192.168.103.0/24. For example, 192.168.103.250 (if that address isn't used by anything else). Don't change any cabling or other connections. Simply change the IP address on the computer.
Now ping the router's address in that subnet (192.168.103.254). Does it respond?
It would. The /16 mask puts both addresses in the same subnet.
However, the fact that 192.168.103.114/24 cannot ping 192.168.103.254 indicates a possible VLAN segregation (or something else preventing the traffic from reaching the router). At the moment the subnet 192.168.103.0/24 is on VLAN 3 (eth0.3). If you adjust your computer's NIC driver to specifically tag the interface for VLAN 3, does that change the result of the test?
If you draw a diagram of your network, it may help you to work out what routing you need, what firewall rules you need, and what VLANs (if any) you need.
For routing, all any device ever knows is its next hop. Anything beyond the next hop is outside the routing calculation. "I need to reach address X. My next hop is address Y." And then the device with the address Y does the same calculation. "I need to reach address X. My next hop is address Z." And so on.
I do not know how to draw this. The question seems simple: there are two networks (192.168.100.0/24 and 192.168.103.0/24). On the IP 192.168.100.104 you should be able to access from 192.168.103.0/24. Is the routing I sent really OK? Do you still need firewall rules?
Error1: man have to specify the gateway from the target net (192.168.100.1) for the static route. I used the gateway of the source network (192.168.103.254).
Error2: I had changed the network mask of the printer to 255.255.0.0 during debugging. If the printer wants to send a packet to 192.168.103.0/24 the packet will not go to the router and can not be delivered.