diff -up dhcp-4.2.5/includes/site.h.max-fd dhcp-4.2.5/includes/site.h

--- dhcp-4.2.5/includes/site.h.max-fd	2016-04-21 15:15:14.618846830 +0200

+++ dhcp-4.2.5/includes/site.h	2016-04-21 15:17:06.529731652 +0200

@@ -275,3 +275,9 @@

    Care should be taken before enabling this option. */

 /* #define SERVER_ID_CHECK */

+

+/* Limit the value of a file descriptor the serve will use

+   when accepting a connecting request.  This can be used to

+   limit the number of TCP connections that the server will

+   allow at one time.  A value of 0 means there is no limit.*/

+#define MAX_FD_VALUE 200

diff -up dhcp-4.2.5/omapip/listener.c.max-fd dhcp-4.2.5/omapip/listener.c

--- dhcp-4.2.5/omapip/listener.c.max-fd	2013-01-03 01:02:24.000000000 +0100

+++ dhcp-4.2.5/omapip/listener.c	2016-04-21 15:15:14.618846830 +0200

@@ -239,7 +239,12 @@ isc_result_t omapi_accept (omapi_object_

 			return ISC_R_NORESOURCES;

 		return ISC_R_UNEXPECTED;

 	}

-	

+

+	if ((MAX_FD_VALUE != 0) && (socket > MAX_FD_VALUE)) {

+		close(socket);

+		return (ISC_R_NORESOURCES);

+	}

+

 #if defined (TRACING)

 	/* If we're recording a trace, remember the connection. */

 	if (trace_record ()) {