diff -up dhcp-4.2.5/configure.ac.sd-daemon dhcp-4.2.5/configure.ac
--- dhcp-4.2.5/configure.ac.sd-daemon	2014-07-07 12:13:21.474322606 +0200
+++ dhcp-4.2.5/configure.ac	2014-07-07 12:16:11.320964893 +0200
@@ -714,6 +714,17 @@ if test x$ldap = xyes || test x$ldapcryp
     fi
 fi
 
+AC_ARG_WITH(systemd,
+        AC_HELP_STRING([--with-systemd],
+                       [enable sending status notifications to systemd daemon (default is no)]),
+        [systemd=$withval],
+        [systemd=no])
+
+if test x$systemd = xyes ; then
+   AC_CHECK_LIB(systemd-daemon, sd_notify, ,
+                AC_MSG_FAILURE([*** sd-daemon library not present - do you need to install systemd-libs package?]))
+fi
+
 # Append selected warning levels to CFLAGS before substitution (but after
 # AC_TRY_COMPILE & etc).
 CFLAGS="$CFLAGS $STD_CWARNINGS"
diff -up dhcp-4.2.5/relay/dhcrelay.c.sd-daemon dhcp-4.2.5/relay/dhcrelay.c
--- dhcp-4.2.5/relay/dhcrelay.c.sd-daemon	2014-07-07 12:13:21.329324619 +0200
+++ dhcp-4.2.5/relay/dhcrelay.c	2014-07-07 12:13:21.475322592 +0200
@@ -41,6 +41,10 @@
    int keep_capabilities = 0;
 #endif
 
+#ifdef HAVE_LIBSYSTEMD_DAEMON
+#include <systemd/sd-daemon.h>
+#endif
+
 TIME default_lease_time = 43200; /* 12 hours... */
 TIME max_lease_time = 86400; /* 24 hours... */
 struct tree_cache *global_options[256];
@@ -608,6 +612,14 @@ main(int argc, char **argv) {
 	}
 #endif
 
+#ifdef HAVE_LIBSYSTEMD_DAEMON
+        /* We are ready to process incomming packets. Let's notify systemd */
+        sd_notifyf(0, "READY=1\n"
+                   "STATUS=Dispatching packets...\n"
+                   "MAINPID=%lu",
+                   (unsigned long) getpid());
+#endif
+
 	/* Start dispatching packets and timeouts... */
 	dispatch();
 
diff -up dhcp-4.2.5/server/dhcpd.c.sd-daemon dhcp-4.2.5/server/dhcpd.c
--- dhcp-4.2.5/server/dhcpd.c.sd-daemon	2014-07-07 12:13:21.419323370 +0200
+++ dhcp-4.2.5/server/dhcpd.c	2014-07-07 12:16:57.838319165 +0200
@@ -60,6 +60,10 @@ static const char url [] =
 
 #include "trace.h"
 
+#ifdef HAVE_LIBSYSTEMD_DAEMON
+#include <systemd/sd-daemon.h>
+#endif
+
 #ifndef UNIT_TEST
 static void usage(void);
 #endif
@@ -869,6 +873,15 @@ main(int argc, char **argv) {
 			     (omapi_object_t *)0, "state", server_running);
 
         TRACE(DHCPD_MAIN());
+
+#ifdef HAVE_LIBSYSTEMD_DAEMON
+        /* We are ready to process incomming packets. Let's notify systemd */
+        sd_notifyf(0, "READY=1\n"
+                   "STATUS=Dispatching packets...\n"
+                   "MAINPID=%lu",
+                   (unsigned long) getpid());
+#endif
+
 	/* Receive packets and dispatch them... */
 	dispatch ();