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    <description>数据库按规定待在内网不挂外网，但人不在公司也要连。本文用 iptables DNAT、firewalld、nginx stream 三套方案，把公网 53.32.211.193:25432 转发到内网 192.1.1.23:5432，并讲清 iptables 与 firewalld 不能混用、pg_hba 源地址改写、非标端口不是安全等坑。</description>
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