diff --git a/iptables/templates/iptables-rules.v4.j2 b/iptables/templates/iptables-rules.v4.j2
index 139df04..6a708a8 100644
--- a/iptables/templates/iptables-rules.v4.j2
+++ b/iptables/templates/iptables-rules.v4.j2
@@ -175,6 +175,9 @@
 # tomcat cluster
 -A INPUT -m pkttype --pkt-type multicast -d {{ tomcat_cluster_multicast_addr }} -j ACCEPT
 -A INPUT -m state --state NEW -p tcp -m tcp --dport {{ tomcat_cluster_multicast_port }} -j ACCEPT
+{% if tomcat_cluster_multicast_net is defined %}
+-A INPUT -d {{ tomcat_cluster_multicast_net }} -j ACCEPT
+{% endif %}
 {% endif %}
 {% if ganglia_enabled is defined %}
 {% if ganglia_enabled %}