diff --git a/ofdpa/ipv6_flows.py b/ofdpa/ipv6_flows.py
index 7f66742..e7f61c1 100644
--- a/ofdpa/ipv6_flows.py
+++ b/ofdpa/ipv6_flows.py
@@ -43,7 +43,7 @@
                 self.controller,
                 eth_type=0x86dd,
                 ip_proto=0x3A,
-                send_barrier=False
+                send_barrier=True
                 )
 
             ports = config[ "port_map" ].keys( )
@@ -1088,4 +1088,4 @@
         finally:
             delete_all_flows( self.controller )
             delete_groups( self.controller, Groups )
-            delete_all_groups( self.controller )
\ No newline at end of file
+            delete_all_groups( self.controller )
diff --git a/ofdpa/utils.py b/ofdpa/utils.py
index ce45065..0edc030 100644
--- a/ofdpa/utils.py
+++ b/ofdpa/utils.py
@@ -280,7 +280,7 @@
         for other_port in ports:
             # add l2 interface group
             l2gid, msg = add_one_l2_interface_group( controller, other_port, vlan_id=port_to_out_vlan[other_port],
-            is_tagged=True, send_barrier=False )
+            is_tagged=True, send_barrier=True )
             Groups._put( l2gid )
             # add l3 interface group
             l3group_ucast_msg = add_l3_interface_group( controller, other_port, port_to_out_vlan[other_port], port_to_in_vlan[other_port],