Once Zen is installed and the system has been rebooted you can access the Zen Load Balancer web-based management through the IP address you gave the machine during installation:
Once you login to the web management area you’ll want to configure your network. Simply go to the Settings > Interfaces section to view and modify your networking. Zen uses iproute2 with a different route table for each network interface, you should configure a different default gateway on the interface configuration section and a default gateway for the global configuration. For example, network eth0 receives one connection, this connection will be use the eth0 gateway, but if Zen has to connect to a ntp server, dns server or any other non load balanced connection then the global default gateway will be used.