I've recently taken over the border of a multibillion dollar company. They were a small company that has gone gangbusters nearly doubled in size in the last 10 years. We're now at the point where we are starting to overrun our primary PAT pool for traffic.
Ultimately I know the answer is that I need to split traffic between multiple public IP addresses, but part of the issue with a company growing this much is that documentation of network needs has not been great. We have no idea who has a third party that has whitelisted our current public IP and even the app and server teams have no idea who they have.
How would you handle this challenge in your network? Any advice for someone taking over the firewall and security infrastructure for a company going through these growing pains?
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