diff --git a/install/kubernetes/cilium/templates/cilium-configmap.yaml b/install/kubernetes/cilium/templates/cilium-configmap.yaml
index 13c4b01414..348d1281b2 100644
--- a/install/kubernetes/cilium/templates/cilium-configmap.yaml
+++ b/install/kubernetes/cilium/templates/cilium-configmap.yaml
@@ -500,4 +500,7 @@ data:
 {{- end }}
 
+{{- if .Values.strictModeCIDR }}
+  strict-mode-cidr: {{ .Values.strictModeCIDR | quote }}
+{{- end }}
   enable-xt-socket-fallback: {{ .Values.enableXTSocketFallback | quote }}
   install-iptables-rules: {{ .Values.installIptablesRules | quote }}
diff --git a/install/kubernetes/cilium/values.yaml b/install/kubernetes/cilium/values.yaml
index bbdccc1465..7dece98eac 100644
--- a/install/kubernetes/cilium/values.yaml
+++ b/install/kubernetes/cilium/values.yaml
@@ -550,6 +550,8 @@ encryption:
   # This option is only effective when encryption.type is set to ipsec.
   interface: ""
 
+strictModeCIDR: ""
+
 endpointHealthChecking:
   # -- Enable connectivity health checking between virtual endpoints.
   enabled: true
