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[程序员] 域名解析的双 ip 停掉一个后，无法通过域名请求接口

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  • 现有一个域名：a.com ，解析出的 ip：192.168.0.1 、192.168.0.2

  • 现象：现在灾备切换，将其中一个 ip 停掉，理论上通过 a.com 还是可以访问后台接口，但实际通过代码无法访问。

  • 已排查的情况：

    • 对方本地未做 host
    • 对方 DNS 自动获取
    • 对方服务器 curl 请求域名 & ip 均可访问
    • 对方代码中域名切换 ip 后可正常访问

  • 求教，还有什么场景没考虑到需要排查

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