I have two nics installed:
The one is 10.0.0.20/24 and the router to get the the internet is 10.0.0.1/24
The 2nd is 10.0.100.1/24 and is is the dhcp and dns server for the network
How do I get devices on 10.0.100.x talk to 10.0.0.x devices? Either webmin or the cli.?
Do you want to use the phone system as a router to connect the two LAN’s? If so you can just turn on IP routing in the /etc/sysctl.conf file with the following variable:
Controls IP packet forwarding
net.ipv4.ip_forward = 0
just set it to 1.
The phone system will then act as a router so you will have to use it as a gateway for the devices in the 10.0.0.0/24 network and as a static route for devices in the 10.0.100/0/24.
The correct way to do this is upgrade the Internet router to something with an additional network interface so you can create proper forwarding rules.