I am not a network specialist by trade, and I learn largely by trial and error after working here for 2 years. What I am trying to do now is set up the link between X and Z, figuring out the values in red so that clients and servers behind Z can use internet through X.
Our existing network consists of Y and Z working properly. We also have a VPN trunk established through this link. I am now trying to set up X.
X came to me with LAN IP: 192.168.1.1/24 with DHCP. However, my clients and servers are actually on 192.168.3.*. After extensive reading, I came up with the values in RED. But it never worked for me.
Can I verify, theoretically, whether the setup above should work? If not, what is wrong? Is there an easier or more straight forward configuration to use?
Also, Z (DrayTek 3900) acts as a VPN server for client incoming connections and also maintains another VPN trunk to a remote site. In this case, would it be easier to just always static route X to Z?
Best Answer
It looks to me like you are trying to setup a dual wan connection to the internet. Connection Y being your isp fiber connection, and X being your 4g internet connection. I have done several dual wan setups almost exactly like this. It can be done. But Z needs to be a dual wan capable router, supporting either load balancing (sharing the bandwidth across both connections) or using wan2 as a failover backup wan (wan1 goes down, wan2 comes up). It will not work if your router does not support dual wan. Here is the dual wan router I used for a small business in remote Alaska that had a dsl connection to the isp, and a satellite as backup: http://www.newegg.com/Product/Product.aspx?Item=N82E16833124127