The screenshot below shows all ports grouped together as part of the LAN1 interface. To set the port to a specific interface group, click the radio to make the port member of that group/interface. If you want to re-assign the ports to different interfaces or all the ports to one interface if you are not planning on using the other network interfaces, this can be done on the Port Role menu ( Configuration → Network → Interface → Port Role).

Each interface has specific ports attached to it LAN1 for instance is usually assigned to ports P2 & P3 depending on the ZyWALL model, LAN2 is assigned to P4 and the DMZ on P5. The higher end ZyWALL may have an ExtWLAN interface, an OPT interface or every port is individual (USG300 and higher). By default the LAN1 interface is configured with an IP subnet of 192.168.1.0/24, LAN2 is configured with a subnet of 192.168.2.0/24 and the DMZ is configured with a subnet of 192.168.3.0/24. Each interface uses a different IP subnet. The ZyWALL routers have multiple internal interfaces configured out of the box. This allows you to have multiple networks configured on the router without the use of VLANs to separate the network traffic. The “Port Roles” option on the ZyWALL router gives you the ability to group ports together to create a network which is separate from the other physical ports. This guide will provide step-by-step instructions on changing the RJ-45 port roles, changing interface IP subnet schemes and creating DHCP reservations (static DHCP) on the ZyWALL USG routers.

Zyxel usg flex 200