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It's definitely possible, in fact it's the basis of how routing (routers) work. Through a variety of ways - static routes configured into a local router, updates via a protocol called RIP (Routing Information Protocol) which is essentially routers sharing their routing info, and if all else fails, Default Gateways (DG). DGs are where traffic gets sent when the local router doesn't know where to send it - typically out of your LAN and to the ISP's router. Your PC will have your local router as it's DG, your router will have the ISP's router on it's WAN port as it's DG, and so on. It's a ZTE F609, I'm afraid the is no LAN option on static route. But here's some weird things I noticed, if I connect my device to ZTE, I'm getting the 192.168.1.0 address but not 10.0.0.0 address, that means the 2nd router has become a switch because the OpenWRT router is handling the DHCP even though DHCP is enabled in the 2nd router.
Any idea why? My ultimate goal is that this ZTE must have its own IP because I need it as Samba server, but LAN to LAN is the only option because ZTE is a GPON ONT. – Apr 24 '16 at 14:41. 192.168.1.0/24 cannot talk directly to 10.0.0.0/24 If a device is only on 192.168.1.0/24 then the only way it can communicate with 10.0.0.0/24 is if some other device on 192.168.1.0/24 will help out by routing the traffic. A reason for that restriction is that, in your example, the subnets don't overlap.
A 192.168.0.0/16 can communicate with a 192.168.2.0/24, despite the subnets being different, because there is some overlap. OLD: I have now answered the question that you asked. My guess is that I haven't fully answered what you wanted to know.
If that's the case, feel free to ask another question. UPDATE 1: Thanks for the helpful network diagram. My first inclination is to consider putting LAN2 on 192.168.1/24 and then make the routers act like switches. Commonly the easy way to do that is to plug things into the LAN ports. You may also need to tell the devices to just forward the Layer 2 traffic, and not try to perform Layer 3 routing.
The result might be simpler. However, that approach is not necessary, and we can do things the way that you're actually asking. With the current diagram, one LAN (which I'm going to rename, from 'LAN' to 'LAN1') is at 192.168.1/24 and LAN2 is 10/24. Now, first I want to clarify a concept that I think you may not understand (because your current diagram looks a bit incomplete, since it shows only some of the IPv4 addresses that will need to be used). The 192.168.1/24 address used by your OpenWRT is typically not assigned to the entire OpenWRT device. The 192.168.1/24 address used by your OpenWRT is typically assigned to the specific network port.
So the network port on the OpenWRT which communicates with LAN1 is using the 192.168.1/24 address, and the OpenWRT should have another IPv4 address that communicates with 'MODEM'. In truth, I don't really care what address is being used for the OpenWRT to connect to the MODEM (it might even be a public IPv4 address if the MODEM is using bridging), just as long as it's not in the same subnet as anything else we're using. E.g., if the OpenWRT is using 192.168.0/30 to connect to the modem, then that's fine because that subnet doesn't overlap with anything else that is being used elsewhere.
What is still needed are IPv4 addresses that the OpenWRT and the ZTE use to communicate with each other, over that 'LAN to LAN' cable in your diagram. So assign that link a subnet and assign those network ports an address on the subnet.
E.g., have OpenWRT use 192.168.2.1/30 and the ZTE use 192.168.2.2/30, or have the OpenWRT use 172.16.0.2/30 and the ZTE use 172.16.0.1/30. Side note: You might notice I use an IPv4 /30 in some cases, instead of an IPv4 /24. The '/30' represents the subnet size; a /30 supports 2 devices well, and a /24 supports 254 devices well. I just mention a /30 when you can get away with using a small subnet. However, you could use a /24 instead of a /30, which doesn't really hurt. It may make some addresses be 'wasted' because they aren't as easy to use, but the likely alternative is that they will just remain unused anyway, and you have literally millions of addresses, so it's fine to use either.
If you want to better understand the topic, read further about subnet sizes (especially, see a 'Variable Length Subnet Mask' chart, a.k.a. VLSM chart) and/or CIDR notation. Then, try to have the OpenWRT and ZTE devices 'ping' each other. Very often, devices configured with an internal web server will have a page that provides access to create a 'ping' test.
I suggest you make sure that works before you try to get routing functional. Once every device can communicate with the neighboring devices, then start trying to make sure every device has the needed routes to get traffic to other devices on the network. If your PCs cannot communicate, try using a 'ping' test to determine which network ports you can successfully ping on the remote devices. You may need to adjust some firewalls (like the 'Windows Firewall' software) to make sure devices can respond to ping. (If you have the available hardware, it may be helpful if you have a switch connect to one port on the router, and have multiple PCs connect to that switch, to see if the devices on the same subnet can ping each other.
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That can help determine whether devices respond to ping, without needing to worry as much about interference by a router.) You might want to ask more questions about how to enable routing. However, I suggest that you don't even think about doing that until you assign all of the IPv4 addresses that you need to get assigned. Once you get those addresses assigned, you will probably help us well by providing an updated network diagram before asking other questions about how to get the routing working.