The Software Defined Network（SDN）can provide simple and flexible network configuration and management.Recently

many proposals utilize the SDN controller as the Address Resolution Protocolproxy（ARP）

which obviously reduces the volume of broadcast flow in data plane and avoids the waste of bandwidth.However

since the recent controller has to use pro-active way to setup flow entries

it will cause the scalability problem when dealing with large amount of broadcast packets.Therefore

we propose a novel approach named Gater

which is a SDN-based distributed ARP proxy.Our approach uses the gateways as the ARP proxies

and they will respond to the ARP request in the corresponding LAN.According to the experimental results

our approach not only reduces the broadcast flow data in the network and the ARP response delay

but also lightens the payload of controller to achieve higher scalability.