Changing the default gateway LAN/DHCP

Hi I have just setup the balance 580 and working fine. But we have endian as the gateway, I still like it to filter the viruses and spam out. So I like to add endian as the default gateway in DHCP settings. I just do not see a place to enter that. Can you please tell me how to do this?

thank you

Since the Endian appliance is acting as your firewall, I recommend deploying the Balance 580 in drop-in mode. This way the Endian can be the default gateway for the LAN clients instead of the Peplink.