Cascaded network using 2 router but allow communication between 2 network without accces to router that connect moderm

jertu285 · Feb 16, 2016

I don't know if it's a silly question, but I'm not very good at networking. So please help me out.

i am try to implemnt 2 network: network A is for all computer devices and network B is camera network. This 2 network should in different subnet to prevent possible ip conflict problem. i have router A in network A that connect to ISP modem for inter access and a Router B on network B for cascaded network. Network A should consists ip 192.168.10.X/24 and network B should have 192.168.20.X/24.

I been trying cascade network; joining the WAN port of router B with LAN port of router A and allow different DHCP on router B to create two different network.

I success to get 2 different network using this method which is Network A :192.168.10.X and Network B :192.168.20.X; but the problem is the devices in Netowork A unable access to cameras in Network B . Is it possible to allow devices in Network A access to camera in Network B without doing any modification on router A? this is because i have no authority to access router A.

abailey · Feb 16, 2016

Router B is what is causing your problem. It sounds like you have the firewall turned on, on router B and thus things coming into the WAN port are being blocked. In other words you can probably see Network A from Network B but you cannot see Network B from Network A. I don't know what kind of router you have (router B) but it may be possible to turn off the firewall part

jertu285 · Feb 16, 2016

abailey :

Sry for late reply,

The router i using is Cisco RV320 Gigabit Dual WAN VPN Router. I have close the firewall in router B and still the devices in network A still unable to see the camera. For example device with ip 192.168.10.50 try to ping camera with ip 192.168.20.50 is failed, but i can ping the router B ip that assign by router A on WAN port which is 192.168.10.100.

abailey · Feb 17, 2016

I think the problem is you don't have a route from 192.168.10 to 192.168.20. This can be difficult without access to router A. Without purchasing another router one way to add a route is to add it manually per machine. For example if you have a Windows PC try this:
At the command prompt type: route add 192.168.20.0 mask 255.255.255.0 192.168.10.100 metric 2
If that works you can make that route permanent by running that command again using the -p option.

Forgot to add, make sure NAT is also turned off on Router B.

jertu285 · Feb 17, 2016

abailey :

Yes, i think that would be the problem. When i doing a simulation test, after add a static route in PC , i able to ping the camera even in different subnet. But then the real working enviroment is that the network A is belong to other company and i have no authority to access their network or their pc.

So are there any alternative way to do that? or this is the only solution? If that so i might need to reconsider to use cascaded router to solve this ip conflict problem.

abailey · Feb 17, 2016

I am not really sure how your network is laid out but I believe the RV320 can handle more than two subnets. So would it be possible to come out of router A directly in to the RV320. Then create a new network, say 192.168.30 for your computers and devices, and on another port create 192.168.20 for your cameras? By routing both subnets through the RV320 then you will be able to control the routing between the two. Then all traffic to the internet would go to router A.

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