Sharing WAN - LAN net

Hi everyone,

I’m working for a client whose factory and office networks are not separated, which means that 192.168.4.xx (office) and 192.168.10.xx (factory) ranges share the same network.

I’m using an eWON Cosy 131 to remotely access the factory network.

My problem here is:

1.- The eWON is getting its WAN IP from network 192.168.4.xx (DHCP)
2.- I have to access to LAN network 192.168.10.xx
3.- Both networks are connected together on the WAN side, which means I cannot “isolate” 192.168.10.xx on the LAN side of the eWON.

While looking for a solution, we tried a temporary “non-elegant” way by just connecting a bridge cable between WAN and LAN ports on the eWON, which it appears to work but this makes the eWON Internet connection continuously ON and OFF.

There would be any solution to this situation through the eWON configuration?

Thanks!

usually what we recommend in a case like this would be to buy something like a cheap router and make it so that the WAN coming into the device has a different IP addreess. But if you already have the WAN and LAN segregated into different IP ranges, you should be fine with having them both at 192.168.10.xxx and 192.168.4.xxx as long as you make the mask be 255.255.255.0.

But if you need to be able to reach devices in both the 192.168.10.xxx and 192.168.4.xxx then I’d recommend making the mask be 255.255.0.0 and then use a router to make it so the incoming WAN address is outside of the 192.168.xxx.xxx range

Thanks for your help.

I’m still having some doubts.

In a practical way, how would the connections be? I mean, WAN cable coming to the eWON is the one and only having access to both 192.168.4.xx and 192.168.10.xx ranges, as they share the same physical network.

As far as I know, when connecting through eCatcher, I will be able to find devices on LAN side. What about this situation where there are no 2 physical networks but only 1?

In this case you would have a WAN cable coming in that has an address other that 192.168.xxx.xxx so that the local side would include everything in the 192.168.xxx.xxx range.

You are correct though, you will only be able to reach the LAN side of the Ewon when you’re connecting through eCatcher. When changing the mask this way, your LAN side would be the whole 192.168.0.0 to 192.168.255.255 range and you’d need to have your WAN be outside of that range.