如果ros的防火墙会话数很高，建议修改相应会话超时参数如下：
[admin@cddst] > ip fire conn tra pr                            
              enabled: yes
    tcp-syn-sent-timeout: 30s
  tcp-syn-received-timeout: 30s
  tcp-established-timeout: 3h
    tcp-fin-wait-timeout: 30s
    tcp-close-wait-timeout: 30s
    tcp-last-ack-timeout: 30s
    tcp-time-wait-timeout: 30s
      tcp-close-timeout: 10s
          udp-timeout: 30s
      udp-stream-timeout: 3m
          icmp-timeout: 30s
        generic-timeout: 10m   

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