diff --git a/xCAT/postscripts/configeth b/xCAT/postscripts/configeth
index 98807699e..b2ca8a318 100755
--- a/xCAT/postscripts/configeth
+++ b/xCAT/postscripts/configeth
@@ -26,18 +26,17 @@ fi
 ########################################################################
 # networkmanager_active=0: use network.service
 # networkmanager_active=1: use NetworkManager
+# networkmanager_active=2: RH8 postscripts stage, NetworkManager is active but nmcli cannot modify NIC configure file
 ########################################################################
 networkmanager_active=0
-checkservicestatus NetworkManager > /dev/null
-if [ $? -eq 0 ]; then
-    networkmanager_active=1
-else
-    #In RH8 postscripts stage, NetworkManager is active but nmcli cannot modify NIC configure file
-    ps -ef|grep -v grep|grep NetworkManager >/dev/null 2>/dev/null
-    if [ $? -eq 0 ]; then
+if [ -n "$NMCLI_USED" ] ; then
+    if [ "$NMCLI_USED" = "1" ]; then
+        networkmanager_active=1
+    elif [ "$NMCLI_USED" = "2" ]; then
         networkmanager_active=2
     fi
 fi
+
 str_conf_file=""
 str_conf_file_xcatbak=""
 tmp_con_name=""
@@ -657,11 +656,11 @@ elif [ "$1" = "-s" ];then
         echo $NODE > /etc/HOSTNAME
     else
         #write ifcfg-* file for redhat
-        con_name="xcat-install-"${str_inst_nic}
+        con_name="xcat-"${str_inst_nic}
         str_inst_prefix=$(v4mask2prefix ${str_inst_mask})
         str_conf_file="/etc/sysconfig/network-scripts/ifcfg-${str_inst_nic}"
         if [ $networkmanager_active -eq 2 ]; then
-            str_conf_file="/etc/sysconfig/network-scripts/ifcfg-xcat-install-${str_inst_nic}"
+            str_conf_file="/etc/sysconfig/network-scripts/ifcfg-$con_name"
         fi
         if [ $networkmanager_active -eq 1 ]; then
             is_nmcli_connection_exist "$con_name"
@@ -683,7 +682,7 @@ elif [ "$1" = "-s" ];then
             echo "NETMASK=${str_inst_mask}" >> $str_conf_file
             echo "BOOTPROTO=none" >> $str_conf_file
             echo "ONBOOT=yes" >> $str_conf_file
-            echo "NAME=xcat-install-${str_inst_nic}" >> $str_conf_file
+            echo "NAME=${con_name}" >> $str_conf_file
             echo "HWADDR=${str_inst_mac}" >> $str_conf_file
         fi
         if [ $networkmanager_active -eq 2 ]; then
diff --git a/xCAT/postscripts/confignetwork b/xCAT/postscripts/confignetwork
index 232d9890d..07e98aa7c 100755
--- a/xCAT/postscripts/confignetwork
+++ b/xCAT/postscripts/confignetwork
@@ -63,9 +63,7 @@ function get_nic_cfg_file_content {
     elif [ $is_debian -eq 1 ]; then
          cfg_file="$nwdir/${cfg_dev}"
     fi
-    #TODO:this is networkmanager_active=2 
-    ps -ef|grep -v grep|grep NetworkManager >/dev/null 2>/dev/null
-    if [ $? -eq 0 ]; then
+    if [ "$networkmanager_active" != "0" ]; then
         $ip address show dev ${cfg_dev}| $sed -e 's/^/[Ethernet] >> /g' | log_lines info
     else
         if [ -f $cfg_file ]; then
@@ -474,9 +472,11 @@ function configure_nicdevice {
     while [ $num -lt $max ];
     do
         nic_dev=`echo "$nics_pair" |sed -n "${num}p"|awk '{print $1}'`
+        ipaddrs=$(find_nic_ips $nic_dev)
+        multiple_ips=$(echo $ipaddrs|grep "|")
         #If install nic is configured, skip to reconfigure it
-        if [ x"$nic_dev" = x"$installnic" -a $instnic_conf -eq 1 ]; then
-            log_warn "install nic $nic_dev has been configured, skip to reconfigure it."
+        if [ x"$nic_dev" = x"$installnic" -a $instnic_conf -eq 1 -a x"$multiple_ips" = x ]; then
+            log_warn "install nic $nic_dev has been configured, continue."
             ((num+=1))
             continue
         fi
@@ -528,7 +528,6 @@ function configure_nicdevice {
         echo "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
         nic_pair=`echo "$nics_pair" |sed -n "${num}p"`
         echo "configure nic and its device : $nic_pair"
-        ipaddrs=$(find_nic_ips $nic_dev)
         # if a device is middle device, it may have no IP, for example, configure eth0->vlan.1->br0, vlan1.1 is middle device
         # is_mid_device is to label if ${nic_dev} is middle device
         # if $is_mid_device has value, the ${nic_dev} is middle device, or else, it is not middle device
@@ -543,8 +542,8 @@ function configure_nicdevice {
             xcatnet=`query_nicnetworks_net $nic_dev`
             if [ -n "$ipaddrs" ]; then
                 log_info "configure $nic_dev"
-                log_info "call: configeth $nic_dev $ipaddrs $xcatnet"
-                configeth $nic_dev $ipaddrs $xcatnet
+                log_info "call: NMCLI_USED=$networkmanager_active configeth $nic_dev $ipaddrs $xcatnet"
+                NMCLI_USED=$networkmanager_active configeth $nic_dev $ipaddrs $xcatnet
                 if [ $? -ne 0 ]; then
                     errorcode=1
                 fi
@@ -637,27 +636,6 @@ errorcode=0
 #nictypes should support capital letters, for example, Ethernet and ethernet
 utolcmd="sed -e y/ABCDEFGHIJKLMNOPQRSTUVWXYZ/abcdefghijklmnopqrstuvwxyz/"
 
-#get for installnic
-installnic=''
-installnic=`get_installnic`
-instnic_conf=0
-if [ $boot_install_nic -eq 1 ];then
-    if [ -n "$installnic" ]; then
-        echo "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
-        log_info "configure the install nic $installnic. "
-        instnic_conf=1
-        configeth -s $installnic
-        if [ $? -ne 0 ]; then
-            errorcode=1
-        fi
-        get_nic_cfg_file_content $installnic
-        echo "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
-    else
-        log_error "Can not determine proper install nic."
-        errorcode=1
-    fi
-fi
-
 #check if using NetworkManager or  network service
 networkmanager_active=3
 check_NetworkManager_or_network_service
@@ -672,6 +650,28 @@ else
     exit 1
 fi
 
+#get for installnic
+installnic=''
+installnic=`get_installnic`
+instnic_conf=0
+if [ $boot_install_nic -eq 1 ];then
+    if [ -n "$installnic" ]; then
+        echo "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
+        log_info "configure the install nic $installnic."
+        log_info "NMCLI_USED=$networkmanager_active configeth -s $installnic"
+        instnic_conf=1
+        NMCLI_USED=$networkmanager_active configeth -s $installnic
+        if [ $? -ne 0 ]; then
+            errorcode=1
+        fi
+        get_nic_cfg_file_content $installnic
+        echo "++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++"
+    else
+        log_error "Can not determine proper install nic."
+        errorcode=1
+    fi
+fi
+
 #back up all network interface configure files
 nwdirbak=$nwdir".xcatbak"
 ls $nwdirbak > /dev/null 2>/dev/null
diff --git a/xCAT/postscripts/nicutils.sh b/xCAT/postscripts/nicutils.sh
index 204343a99..8b0eeba75 100755
--- a/xCAT/postscripts/nicutils.sh
+++ b/xCAT/postscripts/nicutils.sh
@@ -1587,6 +1587,17 @@ function decode_arguments {
 #
 ##############################################################################
 function check_NetworkManager_or_network_service() {
+    #In RH7.6 postscripts stage, network service is active, but xCAT uses NetworkManager to configure IP,
+    #after that, xCAT disable NetworkManager, when CN is booted, CN use network service.
+    #In RH8, there is only NetworkManager
+    #So check network service should before check NetworkManager.
+    checkservicestatus network > /dev/null 2>/dev/null || checkservicestatus wicked > /dev/null 2>/dev/null 
+    if [ $? -eq 0 ]; then
+        stopservice NetworkManager | log_lines info
+        disableservice NetworkManager | log_lines info
+        log_info "network service is active"
+        return 0
+    fi
     #check NetworkManager is active
     checkservicestatus NetworkManager > /dev/null 2>/dev/null
     if [ $? -eq 0 ]; then
@@ -1604,13 +1615,6 @@ function check_NetworkManager_or_network_service() {
     if [ $? -eq 0 ]; then
         return 2
     fi
-    checkservicestatus network > /dev/null 2>/dev/null || checkservicestatus wicked > /dev/null 2>/dev/null
-    if [ $? -eq 0 ]; then
-        stopservice NetworkManager | log_lines info
-        disableservice NetworkManager | log_lines info
-        log_info "network service is active"
-        return 0
-    fi
     checkservicestatus networking > /dev/null 2>/dev/null
     if [ $? -eq 0 ]; then
         stopservice NetworkManager | log_lines info