diff --git a/cluster/addons/ip-masq-agent/ip-masq-agent.yaml b/cluster/addons/ip-masq-agent/ip-masq-agent.yaml
index 468c174ac43..efa6fe30034 100644
--- a/cluster/addons/ip-masq-agent/ip-masq-agent.yaml
+++ b/cluster/addons/ip-masq-agent/ip-masq-agent.yaml
@@ -8,7 +8,7 @@ metadata:
     kubernetes.io/cluster-service: "true"
     addonmanager.kubernetes.io/mode: Reconcile
 ---
-# https://github.com/kubernetes-incubator/ip-masq-agent/blob/v2.3.0/README.md
+# https://github.com/kubernetes-incubator/ip-masq-agent/blob/v2.4.1/README.md
 apiVersion: apps/v1
 kind: DaemonSet
 metadata:
@@ -32,7 +32,7 @@ spec:
       hostNetwork: true
       containers:
       - name: ip-masq-agent
-        image: k8s.gcr.io/ip-masq-agent-amd64:v2.3.0
+        image: k8s.gcr.io/ip-masq-agent-amd64:v2.4.1
         args:
           - --masq-chain=IP-MASQ
           - --nomasq-all-reserved-ranges
diff --git a/cluster/gce/gci/configure-helper.sh b/cluster/gce/gci/configure-helper.sh
index 78810cfebb6..4593af0b71b 100644
--- a/cluster/gce/gci/configure-helper.sh
+++ b/cluster/gce/gci/configure-helper.sh
@@ -101,13 +101,14 @@ function config-ip-firewall {
     iptables -w -t nat -A IP-MASQ -d 10.0.0.0/8 -m comment --comment "ip-masq: RFC 1918 reserved range is not subject to MASQUERADE" -j RETURN
     iptables -w -t nat -A IP-MASQ -d 172.16.0.0/12 -m comment --comment "ip-masq: RFC 1918 reserved range is not subject to MASQUERADE" -j RETURN
     iptables -w -t nat -A IP-MASQ -d 192.168.0.0/16 -m comment --comment "ip-masq: RFC 1918 reserved range is not subject to MASQUERADE" -j RETURN
-    iptables -w -t nat -A IP-MASQ -d 100.64.0.0/10 -m comment --comment "ip-masq: RFC 6598 reserved range is not subject to MASQUERADE" -j RETURN
-    iptables -w -t nat -A IP-MASQ -d 192.0.0.0/24 -m comment --comment "ip-masq: RFC 6890 reserved range is not subject to MASQUERADE" -j RETURN
+    iptables -w -t nat -A IP-MASQ -d 240.0.0.0/4 -m comment --comment "ip-masq: RFC 5735 reserved range is not subject to MASQUERADE" -j RETURN
     iptables -w -t nat -A IP-MASQ -d 192.0.2.0/24 -m comment --comment "ip-masq: RFC 5737 reserved range is not subject to MASQUERADE" -j RETURN
-    iptables -w -t nat -A IP-MASQ -d 192.88.99.0/24 -m comment --comment "ip-masq: RFC 7526 reserved range is not subject to MASQUERADE" -j RETURN
-    iptables -w -t nat -A IP-MASQ -d 198.18.0.0/15 -m comment --comment "ip-masq: RFC 2544 reserved range is not subject to MASQUERADE" -j RETURN
+    iptables -w -t nat -A IP-MASQ -d 198.51.100.0/24 -m comment --comment "ip-masq: RFC 5737 reserved range is not subject to MASQUERADE" -j RETURN
     iptables -w -t nat -A IP-MASQ -d 203.0.113.0/24 -m comment --comment "ip-masq: RFC 5737 reserved range is not subject to MASQUERADE" -j RETURN
-    iptables -w -t nat -A IP-MASQ -d 240.0.0.0/4 -m comment --comment "ip-masq: Former Class E range obsoleted by RFC 3232 is not subject to MASQUERADE" -j RETURN
+    iptables -w -t nat -A IP-MASQ -d 100.64.0.0/10 -m comment --comment "ip-masq: RFC 6598 reserved range is not subject to MASQUERADE" -j RETURN
+    iptables -w -t nat -A IP-MASQ -d 198.18.0.0/15 -m comment --comment "ip-masq: RFC 6815 reserved range is not subject to MASQUERADE" -j RETURN
+    iptables -w -t nat -A IP-MASQ -d 192.0.0.0/24 -m comment --comment "ip-masq: RFC 6890 reserved range is not subject to MASQUERADE" -j RETURN
+    iptables -w -t nat -A IP-MASQ -d 192.88.99.0/24 -m comment --comment "ip-masq: RFC 7526 reserved range is not subject to MASQUERADE" -j RETURN
     iptables -w -t nat -A IP-MASQ -m comment --comment "ip-masq: outbound traffic is subject to MASQUERADE (must be last in chain)" -j MASQUERADE
   fi