diff --git a/puppet-manifests/src/modules/platform/manifests/dns.pp b/puppet-manifests/src/modules/platform/manifests/dns.pp
index fce785bc7..4d7f2a7a7 100644
--- a/puppet-manifests/src/modules/platform/manifests/dns.pp
+++ b/puppet-manifests/src/modules/platform/manifests/dns.pp
@@ -14,6 +14,7 @@ class platform::dns::dnsmasq
 
   # dependent template variables
   $install_uuid = $::install_uuid
+  $system_mode = $::platform::params::system_mode
 
   include ::platform::params
   $config_path = $::platform::params::config_path
diff --git a/puppet-manifests/src/modules/platform/templates/dnsmasq.conf.erb b/puppet-manifests/src/modules/platform/templates/dnsmasq.conf.erb
index 633a21b7b..c15cad335 100644
--- a/puppet-manifests/src/modules/platform/templates/dnsmasq.conf.erb
+++ b/puppet-manifests/src/modules/platform/templates/dnsmasq.conf.erb
@@ -130,6 +130,12 @@ server=/<%= @service_domain %>/<%= @dns_service_ip %>
 cname=registry.local,controller
 cname=registry-token-server.local,controller
 
+<%- if @system_mode == 'simplex' -%>
+cname=controller,controller.internal
+cname=controller-0,controller-0.internal
+cname=controller-1,controller-1.internal
+<%- end -%>
+
 <%- if @distributed_cloud_role == 'systemcontroller' -%>
 cname=registry.central,controller
 <%- end -%>