diff --git a/configure.in b/configure.in
index 4fc2b0a65..cf71aa7b0 100644
--- a/configure.in
+++ b/configure.in
@@ -107,6 +107,13 @@ AC_ARG_WITH(
 )
 AC_SUBST(LINUX_HEADERS)
 
+AC_ARG_WITH(
+    [routing-table],
+    AS_HELP_STRING([--with-routing-table=num],[use routing table for IPsec routes (default: 100)]),
+    [AC_DEFINE_UNQUOTED(IPSEC_ROUTING_TABLE, $withval) AC_SUBST(IPSEC_ROUTING_TABLE, "$withval")], 
+    [AC_DEFINE_UNQUOTED(IPSEC_ROUTING_TABLE, 100) AC_SUBST(IPSEC_ROUTING_TABLE, "100")]
+)
+
 AC_ARG_WITH(
     [uid],
     AS_HELP_STRING([--with-uid=uid],[change user of the daemons to UID after startup (default is 0).]),
diff --git a/src/_updown/Makefile.am b/src/_updown/Makefile.am
index 27a467c4f..a0809907a 100644
--- a/src/_updown/Makefile.am
+++ b/src/_updown/Makefile.am
@@ -1,3 +1,10 @@
 dist_ipsec_SCRIPTS = _updown
+CLEANFILES = _updown
 dist_man8_MANS = _updown.8
+EXTRA_DIST = _updown.in
 
+_updown : _updown.in
+	sed \
+	-e "s:\@IPSEC_ROUTING_TABLE\@:$(IPSEC_ROUTING_TABLE):" \
+	$< > $@
+	chmod +x $@
diff --git a/src/_updown/_updown b/src/_updown/_updown.in
old mode 100755
new mode 100644
similarity index 99%
rename from src/_updown/_updown
rename to src/_updown/_updown.in
index 0fadc7690..c35200d6d
--- a/src/_updown/_updown
+++ b/src/_updown/_updown.in
@@ -137,7 +137,7 @@ FAC_PRIO=local0.notice
 # must be enabled
 #
 # special routing table for sourceip routes
-SOURCEIP_ROUTING_TABLE=100
+SOURCEIP_ROUTING_TABLE=@IPSEC_ROUTING_TABLE@
 #
 # priority of the sourceip routing table
 SOURCEIP_ROUTING_TABLE_PRIO=100