diff --git a/xCAT-server/share/xcat/netboot/esxi/38.xcat-enableipv6 b/xCAT-server/share/xcat/netboot/esxi/38.xcat-enableipv6
index bdf7193da..5d5b972eb 100644
--- a/xCAT-server/share/xcat/netboot/esxi/38.xcat-enableipv6
+++ b/xCAT-server/share/xcat/netboot/esxi/38.xcat-enableipv6
@@ -4,12 +4,9 @@ if [  `uname -r` == '4.1.0' ]; then
     #duid=default-duid "\000\001\000\001LnC\304\000\020\030^\340\334";
     duid='default-duid "\000\004';
 
-    for i in `vsish -e get /hardware/machineUUID|grep \\\[|sed -e 's/.*://'|sed -e ':a;N;$!ba;s/\n//g'`; do
+    for i in `vsish -e get /hardware/bios/dmiInfo|grep -A15 UUID|sed -e 's/.*://'|sed -e ':a;N;$!ba;s/\n//g'`; do
         num=`printf "%d" $i`
         tnum=`printf "\\%03o" $i`
-        if [ $num -lt 127 -a $num -gt 31 ]; then
-            tnum=`printf $tnum`
-        fi
         duid=$duid$tnum
     done
     duid=$duid'";'
diff --git a/xCAT-server/share/xcat/netboot/esxi/39.ipv6fixup b/xCAT-server/share/xcat/netboot/esxi/39.ipv6fixup
index fd2fc5b5f..45c93f5da 100644
--- a/xCAT-server/share/xcat/netboot/esxi/39.ipv6fixup
+++ b/xCAT-server/share/xcat/netboot/esxi/39.ipv6fixup
@@ -4,12 +4,9 @@ if [  `uname -r` == '5.0.0' ]; then
     #duid=default-duid "\000\001\000\001LnC\304\000\020\030^\340\334";
     duid='default-duid "\000\004';
 
-    for i in `vsish -e get /hardware/machineUUID|grep \\\[|sed -e 's/.*://'|sed -e ':a;N;$!ba;s/\n//g'`; do
+    for i in `vsish -e get /hardware/bios/dmiInfo|grep -A15 UUID|sed -e 's/.*://'|sed -e ':a;N;$!ba;s/\n//g'`; do
         num=`printf "%d" $i`
         tnum=`printf "\\%03o" $i`
-        if [ $num -lt 127 -a $num -gt 31 ]; then
-            tnum=`printf $tnum`
-        fi
         duid=$duid$tnum
     done
     duid=$duid'";'