self.vapi.nat64_add_del_interface(self.pg0.sw_if_index, is_add=0)
self.vapi.nat64_add_del_interface(self.pg1.sw_if_index, is_add=0)
self.vapi.nat64_add_del_interface(self.pg0.sw_if_index, is_add=0)
self.vapi.nat64_add_del_interface(self.pg1.sw_if_index, is_add=0)