diff --git a/xCAT-server/lib/xcat/plugins/dhcp.pm b/xCAT-server/lib/xcat/plugins/dhcp.pm
index 5affd8a3c..46bb6b7c3 100644
--- a/xCAT-server/lib/xcat/plugins/dhcp.pm
+++ b/xCAT-server/lib/xcat/plugins/dhcp.pm
@@ -1604,10 +1604,15 @@ sub process_request
                 my $generatedpath = "$syspath/$dhcpver";
                 my $dhcpd_key = "DHCPDARGS";
 
-                if ($os =~ /sles/i) {
+                # For SLES11+ and RHEL7+ Operating system releases, the 
+                # dhcpd/dhcpd6 configuration is stored in the same file
+                my $os_ver = $os;
+                $os_ver =~ s/[^0-9.^0-9]//g;
+                if (($os =~ /sles/i && $os_ver >= 11) || 
+                    ($os =~ /rhels/i && $os_ver >= 7)) {
+
                     $dhcpd_key = "DHCPD_INTERFACE";
                     if ($usingipv6 and $dhcpver eq "dhcpd6") {
-                        # For SLES, the dhcpd6 "dhcpver" is going to modify the dhcpd conf file with key=DHCPD6_INTERFACE
                         $dhcpd_key = "DHCPD6_INTERFACE";
                         $generatedpath = "$syspath/dhcpd";
                     }
@@ -1667,8 +1672,8 @@ sub process_request
         }
 
         if ($usingipv6) {
-            # sles had dhcpd and dhcpd6 config in the dhcp file
-            if ($os =~ /sles/i) {
+            # sles11.3 and rhels7 has dhcpd and dhcpd6 config in the dhcp file
+            if ($os =~ /sles/i || $os =~ /rhels7/i) {
                 if ($missingfiles{dhcpd}) {
                     $callback->({error=>["The file /etc/sysconfig/dhcpd doesn't exist, check the dhcp server"]});
                 }