设置 CIDR/IP，任何人都可以从任何 IP 访问它？

如何设置 CIDR/IP，使任何人都可以从任何地方访问它？ 我试图让我的 AWS RDS DB 实例可以从任何地方访问，因为我的 ISP 没有给我一个静态 IP。每次我的 IP 发生变化，我都要去更改安全记录。

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最佳答案

0.0.0.0/0 does the trick on the EC2 firewall settings

A CIDR defines a range of IP addresses. In the CIDR notation above, /0 is saying "every possible IP".

I like using http://cidr.xyz/ to visualize the range of addresses.

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I'm not familiar with how one configures DB Security Groups, but if you allow access from IP's in this range, you'll allow access from any IP (...): 0.0.0.0/0 ...

From a security perspective, you should not do this. You should authorize the smallest possible group. For example, if only the last portion of your IP changes, e.g. your IP is always 1.2.3.*, then authorize 1.2.3.0/24.

For more information about CIDR notation, drop by Wikipedia: http://en.wikipedia.org/wiki/Classless_Inter-Domain_Routing

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For All IP ADD CIDR for DB Security Group:

If CIDR/IP :O.0.0.0/0 Not Working then Try 

CIDR/IP: 1.1.1.1/32
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If 0.0.0.0/0 doesn't work you can try:

0.0.0.0/1
128.0.0.0/2
192.0.0.0/3
224.0.0.0/4

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