--- services.inc		2015-07-29 07:19:52.404300461 -0500
+++ services-new.inc	2015-07-29 07:06:50.017667220 -0500
@@ -853,8 +853,10 @@
 			if (!empty($dhcpifconf['rootpath'])) {
 				$dhcpdconf .= "	option root-path \"{$dhcpifconf['rootpath']}\";\n";
 			}
+			$dhcpdconf .= "	if substring (option vendor-class-identifier, 0, 9) = \"PXEClient\" {\n";
+			$dhcpdconf .= "		option dhcp-parameter-request-list = concat(option dhcp-parameter-request-list,d0,d1,d2,d3);\n";
+			$dhcpdconf .= "	}\n";
 		}
-
 		$dhcpdconf .= <<<EOD
 }