diff --git a/xCAT-test/autotest/testcase/confignetwork/cases0 b/xCAT-test/autotest/testcase/confignetwork/cases0
index dcdf442f3..a1ce6239c 100644
--- a/xCAT-test/autotest/testcase/confignetwork/cases0
+++ b/xCAT-test/autotest/testcase/confignetwork/cases0
@@ -31,7 +31,7 @@ check:output=~64 bytes from $$CN
 cmd:lsdef -l $$CN | grep status
 check:rc==0
 check:output=~booted
-cmd:installnic=`xdsh $$CN ip addr |grep __GETNODEATTR($$CN,ip)__|awk -F " " '{print $NF}'`; if grep SUSE /etc/*release;then xdsh $$CN "grep __GETNODEATTR($$CN,ip)__ /etc/sysconfig/network/ifcfg-$installnic"; elif grep "Red Hat" /etc/*release;then xdsh $$CN  "grep __GETNODEATTR($$CN,ip)__ /etc/sysconfig/network-scripts/ifcfg-$installnic"; elif grep Ubuntu /etc/*release;then xdsh $$CN "grep __GETNODEATTR($$CN,ip)__ /etc/network/interfaces";else echo "Sorry,this is not supported os"; fi
+cmd:installnic=`xdsh $$CN ip addr |grep __GETNODEATTR($$CN,ip)__|awk -F " " '{print $NF}'`; if grep SUSE /etc/*release;then xdsh $$CN "grep __GETNODEATTR($$CN,ip)__ /etc/sysconfig/network/ifcfg-$installnic"; elif grep "Red Hat" /etc/*release;then xdsh $$CN  "grep __GETNODEATTR($$CN,ip)__ /etc/sysconfig/network-scripts/ifcfg-$installnic"; elif grep Ubuntu /etc/*release;then xdsh $$CN "grep __GETNODEATTR($$CN,ip)__ /etc/network/interfaces.d/*";else echo "Sorry,this is not supported os"; fi
 check:rc==0
 check:output=~__GETNODEATTR($$CN,ip)__
 check:output!~dhcp
@@ -78,7 +78,7 @@ check:output=~64 bytes from $$CN
 cmd:lsdef -l $$CN | grep status
 check:rc==0
 check:output=~booted
-cmd:installnic=`xdsh $$CN ip addr |grep __GETNODEATTR($$CN,ip)__|awk -F " " '{print $NF}'`; if grep SUSE /etc/*release;then xdsh $$CN "grep __GETNODEATTR($$CN,ip)__ /etc/sysconfig/network/ifcfg-$installnic"; elif grep "Red Hat" /etc/*release;then xdsh $$CN  "grep __GETNODEATTR($$CN,ip)__ /etc/sysconfig/network-scripts/ifcfg-$installnic"; elif grep Ubuntu /etc/*release;then xdsh $$CN "grep __GETNODEATTR($$CN,ip)__ /etc/network/interfaces";else echo "Sorry,this is not supported os"; fi
+cmd:installnic=`xdsh $$CN ip addr |grep __GETNODEATTR($$CN,ip)__|awk -F " " '{print $NF}'`; if grep SUSE /etc/*release;then xdsh $$CN "grep __GETNODEATTR($$CN,ip)__ /etc/sysconfig/network/ifcfg-$installnic"; elif grep "Red Hat" /etc/*release;then xdsh $$CN  "grep __GETNODEATTR($$CN,ip)__ /etc/sysconfig/network-scripts/ifcfg-$installnic"; elif grep Ubuntu /etc/*release;then xdsh $$CN "grep __GETNODEATTR($$CN,ip)__ /etc/network/interfaces.d/*";else echo "Sorry,this is not supported os"; fi
 check:rc==0
 check:output=~__GETNODEATTR($$CN,ip)__
 check:output!~dhcp
@@ -154,7 +154,7 @@ cmd:xdsh $$CN "mkdir -p /tmp/backupnet/"
 check:rc==0
 cmd:if grep SUSE /etc/*release;then xdsh $$CN "cp -f /etc/sysconfig/network/ifcfg-* /tmp/backupnet/"; elif grep "Red Hat" /etc/*release;then xdsh $$CN "cp -f /etc/sysconfig/network-scripts/ifcfg-* /tmp/backupnet/"; elif grep Ubuntu /etc/*release;then xdsh $$CN "cp -f /etc/network/interfaces.d/* /tmp/backupnet/;cp -f /etc/network/interfaces /tmp";else echo "Sorry,this is not supported os"; fi
 check:rc==0
-cmd:mkdef -t network -o 11_1_0_0-255_255_0_0 net=11.1.0.0 mask=255.255.0.0 mgtifname=$$SECONDNIC mtu=1496
+cmd:mkdef -t network -o 11_1_0_0-255_255_0_0 net=11.1.0.0 mask=255.255.0.0 mgtifname=$$SECONDNIC 
 check:rc==0
 cmd:chdef $$CN nicips.$$SECONDNIC=11.1.0.100 nictypes.$$SECONDNIC=Ethernet nicnetworks.$$SECONDNIC=11_1_0_0-255_255_0_0
 check:rc==0
@@ -162,7 +162,6 @@ cmd:updatenode $$CN -P "confignetwork -s"
 check:rc==0
 cmd:if grep SUSE /etc/*release;then xdsh $$CN "grep 11.1.0.100 /etc/sysconfig/network/ifcfg-$$SECONDNIC"; elif grep "Red Hat" /etc/*release;then xdsh $$CN  "grep 11.1.0.100 /etc/sysconfig/network-scripts/ifcfg-$$SECONDNIC"; elif grep Ubuntu /etc/*release;then xdsh $$CN "grep 11.1.0.100 /etc/network/interfaces.d/$$SECONDNIC";else echo "Sorry,this is not supported os"; fi
 check:output=~11.1.0.100
-check:output=~MTU=1496
 cmd:installnic=`xdsh $$CN ip addr |grep __GETNODEATTR($$CN,ip)__|awk -F " " '{print $NF}'`; if grep SUSE /etc/*release;then xdsh $$CN "grep __GETNODEATTR($$CN,ip)__ /etc/sysconfig/network/ifcfg-$installnic"; elif grep "Red Hat" /etc/*release;then xdsh $$CN  "grep __GETNODEATTR($$CN,ip)__ /etc/sysconfig/network-scripts/ifcfg-$installnic"; elif grep Ubuntu /etc/*release;then xdsh $$CN "grep __GETNODEATTR($$CN,ip)__ /etc/network/interfaces";else echo "Sorry,this is not supported os"; fi
 check:rc==0
 check:output=~__GETNODEATTR($$CN,ip)__
@@ -194,6 +193,7 @@ cmd:updatenode $$CN -P confignetwork
 check:rc==0
 cmd:if grep SUSE /etc/*release;then xdsh $$CN "grep 11.1.0.100 /etc/sysconfig/network/ifcfg-$$SECONDNIC"; elif grep "Red Hat" /etc/*release;then xdsh $$CN  "grep 11.1.0.100 /etc/sysconfig/network-scripts/ifcfg-$$SECONDNIC"; elif grep Ubuntu /etc/*release;then xdsh $$CN "grep 11.1.0.100 /etc/network/interfaces.d/$$SECONDNIC";else echo "Sorry,this is not supported os"; fi
 check:output=~11.1.0.100
+cmd:if grep SUSE /etc/*release;then xdsh $$CN "grep MTU /etc/sysconfig/network/ifcfg-$$SECONDNIC"; elif grep "Red Hat" /etc/*release;then xdsh $$CN  "grep MTU /etc/sysconfig/network-scripts/ifcfg-$$SECONDNIC"; elif grep Ubuntu /etc/*release;then xdsh $$CN "grep MTU /etc/network/interfaces.d/$$SECONDNIC";else echo "Sorry,this is not supported os"; fi
 check:output=~MTU=1496
 cmd:rmdef -t network -o 11_1_0_0-255_255_0_0
 cmd:if grep SUSE /etc/*release;then xdsh $$CN "rm -rf /etc/sysconfig/network/ifcfg-$$SECONDNIC"; elif grep "Red Hat" /etc/*release;then xdsh $$CN "rm -rf /etc/sysconfig/network-scripts/ifcfg-$$SECONDNIC"; elif grep Ubuntu /etc/*release;then xdsh $$CN "rm -rf /etc/network/interfaces.d/$$SECONDNIC";else echo "Sorry,this is not supported os"; fi
@@ -228,10 +228,10 @@ check:output=~aliases1-1
 check:output=~aliases1-2
 cmd:updatenode $$CN -P confignetwork 
 check:rc==0
-cmd:if grep SUSE /etc/*release;then xdsh $$CN "grep 11.1.0.100 /etc/sysconfig/network/ifcfg-$$SECONDNIC"; elif grep "Red Hat" /etc/*release;then xdsh $$CN  "grep 11.1.0.100 /etc/sysconfig/network-scripts/ifcfg-$$SECONDNIC"; elif grep Ubuntu /etc/*release;then xdsh $$CN "grep 11.1.0.100 /etc/network/interfaces";else echo "Sorry,this is not supported os"; fi
+cmd:if grep SUSE /etc/*release;then xdsh $$CN "grep 11.1.0.100 /etc/sysconfig/network/ifcfg-$$SECONDNIC"; elif grep "Red Hat" /etc/*release;then xdsh $$CN  "grep 11.1.0.100 /etc/sysconfig/network-scripts/ifcfg-$$SECONDNIC"; elif grep Ubuntu /etc/*release;then xdsh $$CN "grep 11.1.0.100 /etc/network/interfaces.d/*";else echo "Sorry,this is not supported os"; fi
 check:output=~11.1.0.100
 check:output!~dhcp
-cmd:if grep SUSE /etc/*release;then xdsh $$CN "grep 12.1.0.100 /etc/sysconfig/network/ifcfg-$$SECONDNIC"; elif grep "Red Hat" /etc/*release;then xdsh $$CN  "grep 12.1.0.100 /etc/sysconfig/network-scripts/ifcfg-$$SECONDNIC"; elif grep Ubuntu /etc/*release;then xdsh $$CN "grep 12.1.0.100 /etc/network/interfaces";else echo "Sorry,this is not supported os"; fi
+cmd:if grep SUSE /etc/*release;then xdsh $$CN "grep 12.1.0.100 /etc/sysconfig/network/ifcfg-$$SECONDNIC"; elif grep "Red Hat" /etc/*release;then xdsh $$CN  "grep 12.1.0.100 /etc/sysconfig/network-scripts/ifcfg-$$SECONDNIC"; elif grep Ubuntu /etc/*release;then xdsh $$CN "grep 12.1.0.100 /etc/network/interfaces.d/*";else echo "Sorry,this is not supported os"; fi
 check:output=~12.1.0.100
 check:output!~dhcp
 cmd:rmdef -t network -o 11_1_0_0-255_255_0_0