We are going to set up the Banana Pi R4 as a DHCP server that assigns IP addresses on multiple subnets. The Banana Pi R3 has four 1-gigabit Ethernet ports, which we will use to create four subnets. These four subnets will allow traffic to be routed between them. There are three Local Area Network (LAN) ports and one Wide Area Network (WAN) port. Which we will connect the WAN port to the local network that is connected to the Internet. The three remaining ports will allow for three networks... https://www.linux.org/threads/banana-pi-r4-bpi-r4-dhcp-for-multiple-subnets.61666/