diff --git a/installer/ogboot_installer.sh b/installer/ogboot_installer.sh
index 56529f1..f2ff08f 100644
--- a/installer/ogboot_installer.sh
+++ b/installer/ogboot_installer.sh
@@ -721,6 +721,16 @@ function backupFile()
 	echoAndLog "${FUNCNAME}(): $file backup success"
 }
 
+mask2cidr() {
+    IFS='.' read -ra ADDR <<< "$1"
+    CIDR=0
+    for i in "${ADDR[@]}"; do
+        CIDR=$((CIDR+$(echo "obase=2; ibase=10; $i" | bc | tr -cd '1' | wc -c)))
+    done
+    echo $CIDR
+}
+
+
 
 ##########################################################################
 ################################main######################################
@@ -791,6 +801,7 @@ if [ $? -ne 0 ]; then
 	exit 1
 fi
 
+
 #downloadComposer
 #
 #runComposer