在配置使用双向SSL的KAFKA（KAFKA_2.13-2.4.1）之后，根据文档，当由kafka-console-producer.sh发送消息时，可以由消费者（Kafka-Console-Consumer.sh）接收消息。
但是，当使用TCPDUMP捕获网络流量时，该协议仍然是TCP，而不是TLSOR SSL。
将-djava.net.debug添加到kafka-console-producer.sh时，可以打印双向SSL握手（从Clienthello到Server finishng）。
为什么我无法获得TSL协议？是错误的吗？
After configured the kafka (kafka_2.13-2.4.1) with two-way SSL per the document https://kafka.apache.org/documentation/#security_ssl, when sent message by the kafka-console-producer.sh, the message can be received by consumer (kafka-console-consumer.sh).
But when use the tcpdump capture the network traffic, the protocol still is TCP, not TLSor SSL.
When added the -Djava.net.debug to the kafka-console-producer.sh, the two-way SSL handshakes can be printed (from ClientHello to server finishng).
Why I cannot get the tsl protocol? Is it wrong way?
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