I have a network on 192.168.1.x consisting of a Windows DHCP server, various client devices and going out via a Sonicwall TZ215.
I am installing a VOIP system which I am putting behind a Draytek 2860n doing DHCP on LAN 192.168.2.x.
The Draytek will have its own broadband connection shortly to WAN1 but in the meantime I am setting its WAN2 port to use the existing broadband on the 1.x network. It will get a DHCP address of 192.168.1.254. This will remain in place when WAN1's broadband comes active both as a failover but also because I want to link it to the LAN objects within 1.x. I want the client PC's in 1x. to be able to access the IP phones in 2.x.
It would be much easier to put everything on the one subnet but I don't want the phones to be reliant on the Windows server in any way. Nor do I want to assign the phones static IP's.
I have not done this before and am not sure what settings I need in which router to allow 1.x to bridge over to 2.x given that the Draytek will be doing NAT behind WAN2 by default. I am not sure if I need to configure a static route, IP routed subnet, or load balance policy in the Draytek. Or perhaps a VPN. Any guidance would be appreciated.