DHCP - UDP 67 and 68 Multiple Occurrences From Single Host

Hello Forum.  On our core switches I've captured clients using port 68 destined to a broadcast address 255.255.255.255 on port 67 throughout the day.  Within a hour period some stationary Windows 7 clients can be found doing this at least 4 times. 
So, what can be causing a client to have this behavior throughout the day?  Is there a setting I should change on the client or on the DHCP server?  Thanks.

Hello Sandeep, in this case the ip request would be recieved from the same voice interface on which the ip helper-address was assigned.
By using the ip helper-address command, a router can be configured to accept a broadcast request for a UDP service and then forward it as a unicast to a specific IP address
Br
Nitin Kharbanda

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    From: Inho Choi[SMTP:[email protected]]
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                         DataOutputStream output_stream = new DataOutputStream(client.getOutputStream());
                         BufferedReader stream_input = new BufferedReader(new InputStreamReader(client.getInputStream()));
                         String msg = "view comments";
                         output_stream.writeBytes(msg);
                         System.out.println("waiting for response");
                             while((line = stream_input.readLine()) != null){
                                  comments.append(line);
                              System.out.println("Comments from server "+comments);     
                        } catch (IOException e) {
                             e.printStackTrace();
              JButton get_view_button() {
                   if (view_button == null) {
                        view_button = new JButton();
                        view_button.setText("View Comments");
                        view_button.addActionListener(new java.awt.event.ActionListener() {
                             public void actionPerformed(java.awt.event.ActionEvent e) {
                                  System.out.println("request sent");
                                  receive_comments_from_server();
                   return view_button;
    }thanks
    Sree

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