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When connecting multiple Virtual Private Clouds (VPCs), it’s best to avoid overlapping IP addresses. VPC peering has strict rules and generally doesn’t work well with overlapping IP ranges. Unless you have a very specific reason, using non-overlapping IP addresses is a safer choice. For more details, you can check out this AWS blog that explains connecting networks with overlapping IP ranges.
If you’re thinking about establishing connectivity between many VPCs, remember that peering works well for a small number, but it becomes complicated as the number of peering connections grows. Managing lots of routes and connections can become a hassle. Instead, consider using services like Transit Gateway or Cloud WAN, which are designed to simplify large-scale network management.
Regarding security, it’s important to clearly define what you need. What type of security guarantees are essential for your setup? What specific features are mandatory? Understanding your security requirements will help you choose the right tools and configurations.
For managing access, start with security groups. They’re easier to manage and usually sufficient. Use Network Access Control Lists (NACLs) only when you need additional restrictions, as they add complexity. The goal is to keep your security setup simple, especially since it makes future maintenance easier.
Route tables also become more complex as you add more peering connections. It’s crucial to plan your routes carefully. Using a Transit Gateway or Cloud WAN can make routing much simpler by acting as a central point that manages traffic across multiple networks.
When it comes to scaling your peering connections, try to avoid having too many at once. Maintaining many peering links can become a lot of work unless you develop automation to handle it. Keep your network simple initially, and scale up thoughtfully.
For more tips on optimizing your AWS network, check out this AWS blog that offers helpful guidance on network management and optimization strategies.
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