events {
    worker_connections  1024;
}

stream {
    upstream stream_backend {
        server dhcp-180.example.com:446;
        server dhcp-185.example.com:446;
        server dhcp-186.example.com:446;
        server dhcp-187.example.com:446;
    }

    server {
        listen     446;
        proxy_pass stream_backend;
    }

}