diff --git a/save-restore.sh b/save-restore.sh
index 8b990a1..0b5be59 100755
--- a/save-restore.sh
+++ b/save-restore.sh
@@ -25,14 +25,25 @@
 #
 #################
 
+##
+# options to control duplicate IP checks:
+#  0 - no checking
+#  1 - in restore, append -exist to ipset add
+#  2 - in parse, run ipcheck test check
+#  3 - in both restore and parse, exist & test
+check=${check:-}  # take default from combine-saves.pl
+
 folder=${folder:-}
 
 savext=${savext:-.save}
 
 db=${db:-name-maxelem.db}
+
 dbtmp=${dbtmp:-$db.tmp}
+
 ipset=${ipset:-$(which ipset)}
 ipsetcmd=${ipsetcmd:-restore}
+
 scriptdir=${scriptdir:-$(dirname $0)}
 savecnt="${scriptdir}/save-count.pl"
 sortcnt="${scriptdir}/combine-counts.pl"
@@ -40,6 +51,10 @@ loadset="${scriptdir}/combine-saves.pl"
 
 files=${files:-"$@"}
 
+if test -n "$check" ; then
+    check="--check=$checkdef";
+fi
+
 if test -z "$files" ; then
     files=$(ls -1 ${folder}*${savext} 2>/dev/null)
 fi
@@ -53,7 +68,7 @@ cat "$files" | \
     $savecnt >$dbtmp \
     && $sortcnt <$dbtmp >$db \
     && cat "$files" \
-	| $loadset $db \
+	| $loadset $check $db \
 	| $ipset $ipsetcmd
 RV=$?
 rm -f $dbtmp 2>/dev/null