这是不可靠的-它不检查数据包是否到达成功。
It's unreliable - it doesn't check whether packets arrive successfully.
当收到这个数据包时，ssh客户机检查在客户端是否启用了这个选项。
The SSH client, on receiving this data packet, checks if the same option is enabled on the client side.
iptables用于建立、维护和检查Linux内核中的ip数据包过滤器规则表。
Iptables are used to set up, maintain, and inspect the tables of IP packet filter rules in the Linux kernel.
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