View source for Stop DHCP INFORM flooding

= Background  =

Windows 7 among others ask for proxy settings using DHCP. The issue is that they do not stop asking until they have received an answer. This results in that the log contains a lot information about these requests, an example can be found below.<br> 
<pre>Jul 1 06:34:09 MorganB3 dnsmasq-dhcp[1638]: DHCPINFORM(br0) 10.69.10.59 00:23:14:c5:33:fc
Jul 1 06:34:09 MorganB3 dnsmasq-dhcp[1638]: DHCPACK(br0) 10.69.10.59 00:23:14:c5:33:fc MorgansVaioF12Z</pre> 
This wiki entry describes how to modify the B3 to stop this traffic. 

= Configuration  =

No specific configuration information is needed<br> 

= Packages  =

No new packages is needed<br> 

= Setup  =

Login to the B3 and become the root user 
<pre>su</pre> 
Go the the dnsmasq config directory and create a new file<br> 
<pre>cd /etc/dnsmasq.d
touch no_proxy.conf</pre> 
Add the following text into the file<br> 
<pre># This will tell DHCP clients to not ask for proxy information
# Some clients, like Windows 7, will constantly ask if not told NO
dhcp-option=252,"\n"</pre> 
= Restart DNS  =

We are now completed so let us restart the server<br> 
<pre>/etc/init.d/dnsmasq restart</pre> 
= Test  =

Look at the log, you should only see one more DHCPINFORM entry per computer connected to the B3, then they should stop asking for proxy information.<br> 
<pre>tail -f /var/log/daemon.log</pre> 
<br>