diff --git a/xCAT-server/lib/xcat/plugins/dhcp.pm b/xCAT-server/lib/xcat/plugins/dhcp.pm
index df4c85317..2782cdc80 100644
--- a/xCAT-server/lib/xcat/plugins/dhcp.pm
+++ b/xCAT-server/lib/xcat/plugins/dhcp.pm
@@ -423,31 +423,6 @@ sub process_request
 
    if (grep /^-n$/, @{$req->{arg}})
     {
-        #support for /etc/sysconfig/dhcpd
-        if(-e "/etc/sysconfig/dhcpd") {
-            my @dhcpdifs = split / /,`grep '^DHCPD_INTERFACE' /etc/sysconfig/dhcpd |sed -e 's/DHCPD_INTERFACE=\"//' |sed -e 's/\"//'`;
-            if(scalar @dhcpdifs > 0) {
-                chomp $dhcpdifs[scalar @dhcpdifs - 1];
-            }
-            #get "mgtifname" from network table
-            my $nettab = xCAT::Table->new("networks");
-            my @nets_ref = $nettab->getAllAttribs('net','mgtifname');
-            
-            foreach(@nets_ref) {
-                my $if = $_->{mgtifname};
-                #add the neccessary mgtifnames to @dhcpifs
-                my $num = grep /$if/, @dhcpdifs;
-                next if ($num > 0);
-                push @dhcpdifs, $if;
-            }
-
-            #update DHCPINTERFACES in the file /etc/sysconfig/dhcpd
-            my @tmp = map {"$_ "} @dhcpdifs;
-            my $output = `sed 's/^DHCPD_INTERFACE=.*$\"/DHCPD_INTERFACE=\"@tmp\"/' /etc/sysconfig/dhcpd`;
-            open DHCPD_FD, '>', "/etc/sysconfig/dhcpd";
-            print DHCPD_FD $output;
-            close DHCPD_FD;
-        }
         if (-e "/etc/dhcpd.conf")
         {
             my $bakname = "/etc/dhcpd.conf.xcatbak";
@@ -507,6 +482,44 @@ sub process_request
             }
         }
     }
+    #add the active nics to /etc/sysconfig/dhcpd
+    if (-e "/etc/sysconfig/dhcpd") {
+        open DHCPD_FD, "/etc/sysconfig/dhcpd";
+        my $syscfg_dhcpd = "";
+        my $found = 0;
+        my $dhcpd_key = "DHCPDARGS";
+        my $os = xCAT::Utils->osver();
+        if ($os =~ /sles/i) {
+            $dhcpd_key = "DHCPD_INTERFACE";
+        }
+
+        my $ifarg = "$dhcpd_key=\"";
+        foreach (keys %activenics) {
+            $ifarg .= " $_";
+        }
+        $ifarg .= "\"\n";
+
+        while (<DHCPD_FD>) {
+            if ($_ =~ m/^$dhcpd_key/) {
+                $found = 1;
+                $syscfg_dhcpd .= $ifarg;
+            }else {
+                $syscfg_dhcpd .= $_;
+            }
+        }
+
+        if ( $found eq 0 ) {
+            $syscfg_dhcpd .= $ifarg;
+        }
+        close DHCPD_FD; 
+
+        open DBG_FD, '>', "/etc/sysconfig/dhcpd";
+        print DBG_FD $syscfg_dhcpd;
+        close DBG_FD;
+    } else {
+        $callback->({error=>"The file /etc/sysconfig/dhcpd doesn't exist, check the dhcp server"});
+        return;
+    }
     unless ($dhcpconf[0])
     {            #populate an empty config with some starter data...
         $restartdhcp=1;