I currently have a home network with a router that contains parental controls but does not support a dual WAN configuration. All my local devices are in a 192.168.1.xx subnet as is the LAN on the existing router. The gateway on all devices is the the ip address of the LAN on the router (192.168.1.243). The WAN on that router is currently connected to my ISP. In addition, I have several "virtual servers" set up on this router to forward incoming requests (VOIP, remote access requests, etc.) to various devices on the LAN network.
I want to implement dual WAN functionality by placing a router that supports that function (but NOT parental controls) between that existing router and the internet. I plan to run a cable between the WAN port of the existing router and the LAN port of the "edge" router (router connected to the internet), setting the WAN on the existing router to 192.168,100.1 and the LAN address of the Edge Router to 192.168.100.243, setting the WAN gateway on the existing router to 192.168.100.243. The new Edge Router will be connected to 2 ISP's and draw WAN ip dynamically from them.
My questions are:
1. I believe I will not have any problems with outgoing requests by the devices make to the internet or responses finding their way to the requesting devices. Is that correct?
2. How do I make sure all incoming requests (such as income SIP calls or other requests originating from the internet) make their way first to the original router so that they can be forwarded by that router to the proper device using the port forwarding information set up on that router? Will that happen automatically or do I need for somehow forward all incoming on all ports to the original router?
Thanks you, in advance for your help and insight!