Port 1 of the card in slot 1 (leftmost) is assigned to IP net 1 (configuration network) in default settings (for routers with 5- or 4-port switch; for routers with 2-port switch, port ETH1 is assigned to IP net 1). This local network has the static IP address 192.168.1.1. It is intended for accessing the router from a configuration PC. The firewall rules for HTTP (port 80) and HTTPS (port 443) access are also entered for this in default settings.
It is recommended to use IP nets 2 and above as well as the other ports for the application to still enable local configuration access to the router. If the application’s requirements or other circumstances do not allow this, port 1 can also be configured accordingly like the other ports. It should be ensured that router access in case of an emergency is still possible using other means.