Using an AWS Managed Prefix List for IP addresses that change

Change all your rules in one place when your IP address changes

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

⚙️ Check out my series on Automating Cybersecurity Metrics. The Code.

🔒 Related Stories: AWS Security | Cloud Security Architecture | Network Security

💻 Free Content on Jobs in Cybersecurity | ✉️ Sign up for the Email List

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Thinking about this because it is affecting me today and I’m having to update some IP addresses…

Have you ever had a scenario where you are using an IP address in a number of places in your network and then that IP address changed and you had to change it in all those places? Did you remember to change it in every single one? Did you have to take the risk of redeploying your network and making a mistake?

What about the scenario where you had to determine a list of IP addresses related to a DNS entry that a vendor gives you for a rule? What if the list of IP addresses associated with that rule changes? Then you have to go update your list of IP addresses in any rule that leverages the IPs or CIDRs to which that domain name resolves.

If you have an IP range or address that you are using in multiple security group rules that can change over time, consider creating a…