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我有负载平衡器应用程序，用于平衡连接在两个不同交换机上的两台服务器之间的拓扑结构， 当我从第一个域发送流量并且选择是来自第二个域的服务器时，只有 syn 数据包到达，然后 RST 从客户端到服务器

平衡器的代码是：

def handle_request_on_server2 (self, packet, event, server):

   "Handling request on server2"

   msg = of.ofp_flow_mod()
   msg.idle_timeout = IDLE_TIMEOUT
   msg.hard_timeout = HARD_TIMEOUT
   msg.buffer_id = None
   msg.priority= 500
   msg.data = event.ofp # Forward the incoming packet

   msg.match.in_port = event.port
   print "in_port = ", event.port
   msg.match.dl_src = packet.src
   print "packet src mac = ", packet.src
   msg.match.dl_dst = LOAD_BALANCER_MAC
   msg.match.dl_type = ethernet.IP_TYPE
   msg.match.nw_src = packet.next.srcip
   msg.match.nw_dst = LOAD_BALANCER_IP 

   # Append actions
   # Set the dst IP and MAC to load balancer's
   # Forward the packet to server's port
   msg.actions.append(of.ofp_action_nw_addr.set_dst(server.ip))
   msg.actions.append(of.ofp_action_dl_addr.set_dst(server.mac))
   msg.actions.append(of.ofp_action_output(port = server.port))
   print "output port = ", server.port
   self.connection.send(msg)

   "  Install reverse rule from server2 to the client in domain1 "

   msg = of.ofp_flow_mod()
   msg.idle_timeout = IDLE_TIMEOUT
   msg.hard_timeout = HARD_TIMEOUT
   msg.buffer_id = None
   msg.priority = 500

   msg.match.in_port = 1
   msg.match.dl_src = server.mac
   msg.match.dl_dst = packet.dst
   msg.match.dl_type = ethernet.IP_TYPE
   msg.match.nw_src = server.ip
   msg.match.nw_dst = packet.next.srcip

   # Append actions
   # Set the src IP and MAC to load balancer's
   # Forward the packet to client's port
   msg.actions.append(of.ofp_action_nw_addr.set_src(LOAD_BALANCER_IP))
  msg.actions.append(of.ofp_action_dl_addr.set_src(LOAD_BALANCER_MAC))
   msg.actions.append(of.ofp_action_output(port = event.port))

   self.connection.send(msg)

当我看到两个交换机上的流表时，我看到流安装正确。谁能告诉我有什么问题？

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