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[宽带症候群] 请问 iptables 做网关,映射出的端口能否屏蔽国外 ip 访问?

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服务器托管在机房,有一个固定的公网 ip ,机房给了一个 centos7 做为网关,使用 iptables 给服务器和服务器上的若干个 vmware 虚拟机做端口映射,来提供服务。
最近莫名其妙被一个乌克兰哈尔科夫的 ip 上传了病毒造成勒索。幸亏及时发现,有云端备份,损失不大。
请问使用 iptables 做网关,映射出去的端口,能否屏蔽国外 ip 访问?

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