diff --git a/pkg/agent/flannel/flannel.go b/pkg/agent/flannel/flannel.go
index ff586fe07d..d7a86f882f 100644
--- a/pkg/agent/flannel/flannel.go
+++ b/pkg/agent/flannel/flannel.go
@@ -71,6 +71,11 @@ func flannel(ctx context.Context, flannelIface *net.Interface, flannelConf, kube
 	go network.SetupAndEnsureIPTables(network.MasqRules(config.Network, bn.Lease()), 60)
 	go network.SetupAndEnsureIPTables(network.ForwardRules(config.Network.String()), 50)
 
+	if config.IPv6Network.String() != emptyIPv6Network {
+		go network.SetupAndEnsureIP6Tables(network.MasqIP6Rules(config.IPv6Network, bn.Lease()), 60)
+		go network.SetupAndEnsureIP6Tables(network.ForwardRules(config.IPv6Network.String()), 50)
+	}
+
 	if err := WriteSubnetFile(subnetFile, config.Network, config.IPv6Network, true, bn); err != nil {
 		// Continue, even though it failed.
 		logrus.Warningf("Failed to write flannel subnet file: %s", err)